| 摘要 |
FIELD: construction engineering. SUBSTANCE: this relates to mining industry and to underground construction activities and can be used for strengthening walls of underground workings and tunnels by spraying concrete. Concrete spraying device has following components: feeder, pipeline, mixing unit, body of mixing chamber, mixing rods. Ends of mixing rods are installed diametrically opposite in body wall. Spraying nozzle is also provided. Rods are installed on external surface of body. Each rod is bevelled at its end and is extended inside chamber through length of its bevelled part. Rods are rectangular in their cross-section and are located in plane of at least one cross-section of mixing chamber body. Aforesaid device allows for intensive mixing of concrete components. It eliminates factors which cause abnormal wear of mixing chamber components, it also prevents plugging. EFFECT: higher efficiency. 1 cl, 5 dwge
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