In tunnel shield construction, the large amount of foam generated by the slurry system is a common and troublesome problem. Foam lowers the density of the slurry and its muck-carrying capacity, causing unstable tunneling parameters of the shield machine; in severe cases, it may trigger pressure imbalance in the chamber, difficult muck discharge, or even the risk of ground settlement. Traditional methods are often limited in effect or bring secondary problems.
Chemi Tech focuses on the field of engineering materials. Addressing the foam pain point in shield construction, we have developed a high-efficiency shield-dedicated defoamer. Our solution is based on in-depth research into the composition of the slurry and the foaming mechanism; the product features rapid foam breaking and long-lasting foam suppression, has good compatibility with the slurry system, and does not affect the core performance of the slurry.
The specific solution steps are as follows: First, our technical team conducts an on-site survey to analyze the slurry composition, foam characteristics, and construction conditions. Second, based on the analysis results, we recommend a matching defoamer model and an initial dosing ratio. Then, we guide the customer to add it at a suitable point in the slurry circulation system; usually, adding it in the early stage of foam generation yields the best effect. Finally, we continuously track the foam control effect and fine-tune the dosage according to changes in the tunneling strata to ensure stable foam suppression throughout the process.
We once served a tunnel project on a city subway extension line. When the project crossed a water-rich sand layer, slurry foam surged dramatically, seriously affecting the tunneling speed and the quality of segment assembly. After using the Chemi Tech defoamer, the foam was significantly suppressed within a short time, the slurry performance returned to stability, and the shield machine was able to advance again with the preset parameters, ultimately ensuring the smooth breakthrough of the tunnel section. The contractor expressed high recognition of the treatment efficiency and results.
Choosing Chemi Tech means choosing a reliable and professional safeguard for shield construction. Our products and technology are designed to help contractors overcome foam obstacles, ensure efficient and smooth operation of the shield machine, and protect tunnel projects.