grout injector in a sentence

1. 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
2. It's difficult to find grout injector in a sentence.