In the process of shield construction, the generation of large amounts of stubborn foam by the sand and mud slurry is a common yet troublesome problem. Such foam not only reduces the efficiency of muck discharge and causes unstable pressure in the chamber, but may also cause cavitation and increased wear in the pumping system and even affect the advancing precision and construction schedule of the shield machine. Traditional manual skimming or general antifoam methods often have limited effect and cannot solve the problem at its root.
In response to this series of market pain points, Chemi Tech, drawing on its deep experience in specialty chemicals research, has introduced a professional-grade sand-slurry antifoam designed specifically for shield engineering. Our solution is based on an in-depth analysis of the shield slurry system, including soil quality, additives and water conditions; the product is characterized by rapid penetration and lasting foam inhibition, and can quickly destroy the foam film structure and prevent the foam from regenerating, thereby safeguarding the stable operation of the construction system.
The specific solution is divided into three steps. The first is on-site diagnosis and sample analysis: our technical engineers conduct an on-site inspection or analyze the causes of foaming and the composition on the basis of slurry samples provided by the customer. The second is customized product selection and formula fine-tuning: we offer antifoams in a range of models to suit different geological conditions and degrees of foam severity, ensuring the best match and the best effect. The third is on-site application guidance and effect tracking: we provide clear recommendations on the dosing points, dilution ratio and dosage, and continuously follow up on the application effect to ensure that the problem is brought under lasting control.
In an urban tunnel construction project in East China, the contractor ran into the problem of unusually abundant slurry foam caused by complex soil layers, which seriously affected the muck discharge efficiency of the screw conveyor. After adopting the customized antifoam provided by Chemi Tech, the foam was markedly suppressed within minutes of addition, the slurry fluidity improved, the chamber pressure of the shield machine returned to stability, and the average daily advancing efficiency rose by about 15%. The project manager reported that the use of the antifoam effectively reduced the frequency of equipment maintenance and provided strong support for completing the project on schedule.
Choosing Chemi Tech means choosing an efficient, professional and reliable auxiliary solution for shield construction. We are committed to using innovative chemicals and technical service to help customers overcome foam obstacles in construction and improve the overall project benefits.