grout injector in a sentence
- As soon as the tunnel boring machine advances 1m forward , 6 pieces of pre - cast concrete segment are fabricated and forming a ring with internal diameter of 5 . 6m to support soil outside , while simultaneous back - filling and 32 - hole chemical grouting injector equipment installed with tunnel boring machine consolidating soil instantaneously to enhance the soil strength . the tunnel boring machine is also equipped with guided top gyroscope and true circularity retaining device for construction accuracy
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