喷混凝土是近年来隧道衬砌中推广使用的一种新工艺。但在施工过程中,由于操作时回弹物的飞溅、粉尘污染,喷头处受水管和输料管的拖带以及喷头笨重等不利因素,使喷射手难以按照施工规定的距离、角度、螺旋动作等要求进行喷射,因而给新工艺的推广工作带来一定的困难。为了改善喷射手的工作条件、加 Sprayed concrete is a new technology used in tunnel lining in recent years. However, in the process of construction, due to unfavorable factors such as splashing of the rebound during operation, dust pollution, dragging of the spout by the water pipe and the delivery pipe, and cumbersome sprinklers, it is difficult for the spitting hand to follow the construction distance, angle, screw action, etc. Requires spraying, and thus to promote the new technology to bring some difficulties. In order to improve the working conditions of the spray hand, plus