TBM主轴承内密封迷宫结构优化改造技术研究

TBM在长距离掘进过程中,由于地质环境复杂,难免遇到涌水、涌泥、涌砂等恶劣地质环境。为解决在大涌水、涌泥、涌砂条件下内密封迷宫结构泥砂清理困难的难题,结合现场施工条件,综合考虑经济性和可行性后,在原设计基础上对主轴承内密封迷宫结构进行优化改造。在不改变原结构的基础上,拆除内密封压紧环、增加新制配套压紧环,并采用加长螺栓固定。改造工作可在24 h内完成,基本不会增加额外费用、不会影响正常掘进。改造完成后施工实践证明,该技术有效阻止了外界渣石、污水、泥浆等污染物进入主轴承内部,从而节省大量维保时间、提高工作效率。

Research on Optimization and Modification Technology of Internal Sealing Labyrinth Structure of TBM Main Bearing

In the long distance tunneling process of TBM,due to the complex geological environment,it is inevitable to encounter severe geological environment such as water gushing,mud surging and sand bursting.In order to solve the problem of cleaning sand from the internal sealing labyrinth structure under the conditions of water gushing,mud surging and sand bursting,the optimization and reconstruction of the inner sealing labyrinth structure of the main bearing on the basis of the original design was carried out in combination with the construction conditions on site and considering the economy and feasibility comprehensively.Based on not changing the original structure,the inner sealing ring was removed and the new matching ring was added,which was fixed with extended bolts.The renovation work could be completed within24 hours,with little additional cost and no impact on normal driving.After the modification,practice has proved that the technology effectively prevents the external slag stone,sewage,mud and other pollutants from entering the main bearing interior,thus saving a lot of maintenance time and improving work efficiency.