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圓形混凝土檢查井的成型：無論是帶底井室還是調節塊均采用芯模振動成型。在試生產帶底檢查井的過程中，脫內模時井底塌落。起初受到一假山制作 不銹鋼鑄件 鋁箔真空袋 七孔梅花管 hdpe硅芯管 液壓鋼壩 PVC軟管 飛行激光打標機 瀝青保溫泵些似乎理論（強調脫內膜產生的負壓）的影響，脫模時井底塌落，經過反復的試驗，排除了原來的錯誤理論的干擾，我們找到了原因，改進了生產工藝，徹底解決帶底井室井底不塌落現象。相繼又解決養護期間井底與井壁接觸處出現環形開裂等現象
3. The molding of round concrete inspection well: both the bottom chamber and the regulating block are formed by core mold vibration. In the process of trial production of inspection well with bottom, the bottom of well collapses when the internal mold is removed. At first, influenced by some seemingly theories (emphasizing the negative pressure produced by the stripping), the bottom hole collapsed when demoulding. After repeated tests, the interference of the original wrong theory was eliminated. We found out the reason, improved the production process, and completely solved the problem of no collapse at the bottom of the well chamber with bottom. The problem of annular cracking at the contact between the bottom hole and the shaft wall during the maintenance period was solved