shotcrete problems and solutions 01

In the process of operating shotcrete machine, there will be conditions like rotor jams, discharge elbow jams and feed delivery pipe jams. The following are reasons caused the jams and solutions.

First, the aggregate is oversize. To solve the feed delivery pipe jams caused by oversize aggregate, should first turn off the machine from rotating and close the pneumatic valve, removed the feed delivery pipe from the elbow end, open the valve of gas path to blow the stock of material out the rotor. Then check the feed delivery pipe, knock blocked section with a sticks, vibrate the tamper loose or empty it (note: turn down the pressure to zero before unpack the feed delivery pipe elbow or pipeline). Finally the feed delivery pipe to the elbow end again, to blow out the tamper with pressed air.

Second, the dry mix contains too much water. For too much water of dry mix, stop the machine, shut off the wind valve, if the discharge elbow is blocked, open the delivery pipe, clean the elbow and rotor material cavity, and reduce the water cement ratio.

Third, the press of convey airflow is too low. For the low conveying air pressure, stop the motor and ventilating duct. If the rotor jammed, seperate apart the blast pipe and upcast ventilation pipe, brush cleaning materials such as the rotor cavity.

Fourth, the fracture section of the blast pipe is too narrow, which leads the small blast volume of air compressor. For small fracture section of the blast pipe and volume, replace large sections of wind, and change for air compressor with large capacity.