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上海北横通道超大盾构完成急曲线施工

2017-08-14 15:07:55   央广网

科学论证“纵横号”必须是个灵活的“大块头”

生活常识告诉我们,小汽车转弯比大卡车要容易得多,原因是小汽车的灵活性高。超级盾构纵横号”开挖断面相当于6层楼的高度,长度超过100m,这个庞然大物的灵活性又如何呢?这个问题需在盾构装备选型阶段就要充分考虑。

为了保证设备对急曲线的适应性,首先对机头是否设置铰接进行了专题论证与优化。通过对安全性、经济性与适应性的综合评估最终选择了固定式盾尾。对盾构的机头及后配套车架采取紧凑型设计,无论是机头还是后配套车架长度与同类型的盾构机相比都要短许多。

除此之外,将机头设计为锥形,也就是头大屁股小,前盾、中盾和尾盾直径依次减小3cm,锥度一方面增加了盾构在土体里的灵活性,也有助于减小盾构机与土体的摩阻力。

同时,在刀盘周边还配备一定数量的超挖刀,当急曲线转弯遇到困难的情况下可以通过对外弧侧土体的超挖帮助转弯。

盾构的锥度以及弧线段的超挖又带来一个新的问题,那就是隧道的建筑空隙增大了,对同步注浆的要求提高了,为此,纵横号”配备了10点注浆。

精心筹划隧道转弯特制乐高块

盾构法施工的原理是在盾构掘进的同时,通过在后盾拼装预制的混凝土衬砌管片实现对外部水土的支护,形成永久隧道结构。

北横通道每环管片的宽度为2m,每环由10块组成,环与环之间,块与块之间通过螺栓连接。管片的拼装过程犹如拼接乐高一样。那么衬砌结构的曲线又是如何形成的呢?

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