Concrete jet (shotcrete machine, concrete sprayer): use of compressed air, continuous delivery of concrete along the pipeline, and the jet plane to go to construction machinery. Dry sub-jet and two types of wet jet, the former by the mixing of pneumatic conveying of dry material, the pressure in the nozzle and mixed with water spray; the latter by the strength of concrete mix or concrete pumping through the nozzle. which widely used in underground engineering, roadway, tunnels, culverts,lining,etc.
Dry jet is divided into two-jet dry type of concrete tank, concrete spiral jet, rotor ,drum wheel concrete jet and wet concrete jet. The jet will be a variety of materials (including water) in accordance with the requirements of the design ratio of full mixing, mixing well to the wet concrete wet material jet,then jet to jet to the concrete surface by spraying.
Wet concrete in the jet on the jet transport in accordance with the different ways can be divided into the dense and dilute conveying flow.
Dense flow of transport is to mix a good wet concrete pumped through the pump nozzle, the nozzle accelerator add compressed air and the concrete is high-speed jet to the surface by spraying. It applies to RPB7 Concrete wet spraying machine.
Detail information:
Output: 7 /h
Pressure: 5 m
Hopper capacity: 170L
Loading height: 1050mm
Suitable slump: 6-18cm
Max. Grain size for spraying: 15mm
Pipe and hose size : 65/55mm
Horizontal converying distance: 120m
Vertical converying distance : 50m
Drop out : <8%
Electric motor: 15KW
Air pressure: 0.3MPa
Use air value: 3 m3/min
Dimensions: 2530×1300×1300mm
Weight : 1100kg
Rarefied flow conveyor is to mix a good wet concrete to the hopper of concrete jet, the jet even distribution of materials to the feed opening, and then wrapped by the compressed air carrying the material through transported to the feeding tube through the nozzle, the nozzle at the mouth of accelerator added, the concrete is high-speed jet to the surface by spraying. This is applied to PZS3000 wet concrete spraying machine.
Detail information:
Output: 5 /h
Max.convey dist.: 35 m
Max.aggregate size: φ15 mm
Concrete slump: 8-15 cm
Hose inner size: φ50/65 mm
Operating air pressure: 0.2-0.6 Mpa
Air consumption: 9-10 /min
Discharge height: 1.17 m
Rotor Rev.: 11 r/min
Main electric motor power: 7.5 kW
Dosing pupmp model: BRJ15
Dosing pump rated pressure: 0.6 Mpa
Dosing pump output: 17.5-88 L/h
Overall dimension: 2050×950×1180 mm
Weight: 1200 kg
What’s more the wet jet has great advantages such as:
1. greatly reduce the machine side and the dust concentration outside the nozzle, eliminating the health hazards to workers.
2. production is high. Dry concrete jet generally not more than 5m3 / h. The use of wet concrete jet, when the manual operation of up to 10m3 / h;
Mechanical hand job, then up to 20m3 / h.
3. resilience is low. When dry spray concrete rebound up to 15% -50% level. wet spray technology. Spring rate can be reduced to 10%.
4. wet spraying, due to the easy control of water-cement ratio, concrete is not a high degree, it can greatly improve the quality of sprayed concrete in the mouth, to improve the uniformity of concrete, and when dry spray, water-cement ratio of concrete by hand injection concept according to experience and visual inspection to be adjusted, the quality of concrete depends largely on the correct machine or hand operation.
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