Next, our shotcrete machine company will lead you to understand the supporting principle of shotcrete machine sprayed concrete. There are main aspects.
1. Isolation. The sprayed concrete layer completely isolates the contact between air and water, so it effectively prevents the surrounding rock damage and spalling caused by weathering and deliquescent. In addition, because concrete is filled in the cracks of the surrounding rock, the original fillings deep in the cracks will not reduce the strength due to weathering, nor will the original fillings be lost due to the action of water.
2. Supporting role. Because sprayed concrete support has good physical and mechanical properties, its compressive strength is relatively high, which can reach more than 200 kg / cm2, so it can also play a role in supporting ground pressure.
3. Filling effect. Due to the high jet velocity, the concrete can fill the cracks, joints, and cavities of the surrounding rock in time, thus greatly increasing the strength of the surrounding rock. Sprayed concrete can be generally divided into dry spray method, semi-wet spray method and wet spray method. Currently, the semi-wet spray method is widely used.
