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上海地铁盾构是从法国FCB公司引进的φ6340mm的土压平衡盾构,它配有同步压浆装置。这是盾构法施工中比较先进的技术,在盾构向前推进时不停地向盾尾空隙中加压注浆材料,通过连续加压,使注浆材料充入建筑空隙而未达到土体相同强度前,能保持与土体压力相当的压力,从而使地面沉降控制在最小的范围。一般讲,使用同步注浆的注浆材科因渗透到盾构开挖面而影响盾构施工,但土压平衡盾构由于切削刀盘内滞留有切削土,因此
Shanghai Metro Shield is introduced from France FCB φ6340mm earth pressure balance shield, which is equipped with synchronous grouting device. This is a relatively advanced technology in the construction of the shield, the shield forward to continue to shield the tail gap pressurized grouting material, through the continuous pressure, grouting material filling the gap without reaching the soil Body before the same strength, can maintain the pressure with the soil pressure, so that the ground subsidence control in the smallest range. In general, grouting materials that use synchronous grouting affect the shield construction due to penetration into the excavation face of the shield. However, because the earth pressure balance shield retains the cutting soil in the cutter head,