Unprecedented nuclear attack with the shield stumbling block off the storm

Three nuclear power a water culvert at 30 meters, the geological information on the 1st axis of the shield tunnel about 35 meters along the hole are strongly weathered, the weathering and the breeze of andesitic basalt. To ensure the safe and smooth shield tunneling, the tunnel section with a new Austrian tunnel method with advance support method of construction workers. The so-called New Austrian Tunneling Method, that is hollowed ground, leaving room for further shield advance of the construction process, which take the drainage works in the nuclear power is an epoch-making for the first time, this holds a lot of people sweat. However, for “invincible, to make progress,” the construction of the Iron Army, there is no more important than the early completion of the nuclear power plant. The face of half soil, half stone geological conditions, the project department of the shield first bedrock encountered along the upper range of the tunnel on both sides of the mud and soft soil reinforcement for high pressure jet, then the use of the bassoon studio program for the tunnel wall advanced support and protection of soil and stone to be a solid body, the use of “blasting excavation, lining shield,” the construction method, the formation of ?8000 mm diameter tunnel. At the same time promptly after the initial excavation shoring (including bolt, steel arch, steel wire mesh, shotcrete) construction, the initial support and advance support to form an integrated steel – concrete shell structure, in order to put a shield pieces of armor. But sometime in the new Austrian tunnel space to complete nearly ten meters (the longest distance NATM to 47 meters), has re-exploration, found in front of the shield there are 40 meters on the axis of weathered rock must be processed by experts demonstration and Design Institute agreed, the project caught red treatment used by the Department, and the use of fly ash into the hole after the cement, sand, water, and the right amount of admixture preparation of fast rigid slurry pressure injection catheter underwater resolve the solid side shield week series of moderate hardness problems. After a year of careful and painstaking hard work to complete the construction, for the shield to create the conditions out of its hole.
After the success of the new Austrian tunneling method, the shield in the shortest time was pushed to the air inside the tunnel. As the air to push the construction, the front shield without resistance, non-binding segment four weeks to control the deformation segment, segment fastening and construction difficulties grouting has become a focus. Project department did not give up, no ready-made construction specifications, find their own way, not the teacher, ask to practice. They guide and support the shield as forward-oriented, no-load advance and assembled pipe films, combined with millimeter precision control, and sand-filling in the tunnel, the segment from the tail of the shield machine, the staff of warehouse to with auxiliary gaskets shield tail segment with rail gap, combined with sand fill in the blank, control segment deformation. After pushing air from the tube sheet construction hole into the cement slurry grouting for reinforcement, the segment with the new Austrian tunneling gap between the fully dense fill. Hard work pays off, quick response in the construction of the Iron Army before stumbling block has been sent packing, the construction of nuclear power industry for the first time the shield off to a good start.