Development and Field Application of an Automated Pipe Jacking Friction Resistance Identification and Warning System in Construction

Abstract

Minimizing frictional resistance is crucial for ensuring the safety and smooth progress of pipe jacking construction. However, due to the unpredictability of geological conditions, it is difficult to grasp the frictional resistance during construction, which poses challenges to safe and smooth construction. In order to reduce the frictional resistance during the process of pipe jacking, an automated pipe jacking friction resistance identification and warning system is thus innovatively proposed. This system uses jacking resistance sensors to identify resistance during the jacking process. When the jacking resistance exceeds a certain threshold, the system will send alerts, which could prompt construction workers to adjust the rheological slurry ratio according to the on-site soil conditions. This system includes the following major components: (1) an analysis of primary factors influencing pipe frictional resistance and a model for resistance calculation, (2) the examination of forces exerted on disturbed soil during pipe jacking construction to determine the optimal placement of resistance sensors, (3) the design and operational principles for an automated resistance identification and warning system, and (4) the application of a slurry shield construction method for resistance reduction. The research has practical significance in providing a reference for developing intelligent pipe jacking and contributing to the improvement in construction safety levels.

A Segmented Calculation Method for Friction Force in Long-Distance Box Jacking Considering the Effect of Lubricant

“…In long-distance pipe jacking projects, lubricants are effective and necessary to reduce the friction forces [6,7]. As shown in Figure 1b, the lubricant consists of bentonite, carboxymethyl cellulose (CMC), sodium hydroxide (NaOH), hydrolyzed polyacrylamide (PHP), and water.…”