In Belgium method of tunneling

Question:
In Belgium method of tunneling

1.construction of invert and side walls is completed before roof arch is built

2.construction of invert is completed before side walls and roof arch are built

3.construction of roof arch is completed before side walls and invert are built

4.construction of side walls is completed before invert and roof arch

Posted Date:-2022-09-25 02:51:35


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