地基下沉。
问题包括排水管被堵、地基下沉，有时甚至出现了严重的结构性裂缝。
Problems include blocked drains, sunken foundations and, sometimes, large structural faults.
当温度变化时管子能在接头中间自由的伸缩，当地基下沉，管子能偏斜，并确保密封无渗漏，从而起到自动补偿目的。
When the temperature changes in the pipe can easily among joint freedom, when foundation sink, the pipe can be skewed, and ensure no leakage seal, and so to automatically compensates for the purpose.
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