At present, along with hydraulic jack pulling on, the 25th element has been placed on its position successfully. The 25th element which is the first element to be immersed in year 2016 according to time schedule. Now HZMB immersed tunnel has reached to 4365m length in construction progress. Whole time of The 25th element immersion operation took less than 22 hours which is the best record of element immersion operation time in such 46 meters deep water situation. It is also a result of victory to race with increasing momentum sediments on foundation trench due to effection of sea sand sucking production surrounding upstream water region.
Generally speaking, Metis® hollow anchor bar can be used as stabilization of tunnel portals, fore-poling, face stabilization, spilling, root piling and radial systematic anchoring， which is the choice of most engineers for tunnel engineering construction. And for this case, it is suitable to choose stainless steel anchor bolt with good capacity of welding and anti-corrosion determine, which can apply to special construction conditions, such as, undersea tunnel, harbor, etc. Compared with common hollow anchor bar, it has better resistance to air, water and chemical reagents.