Concrete pumping construction, concrete cleaning is an essential pump after an important step, a good cleaning method can clean the pipeline, but also can all the concrete pipe delivery to the pouring site, not only do not waste concrete, And economic and environmental protection. S pipe valve concrete pump commonly used in washing the main three kinds, introduced below. 1, direct water method 1) Check the wear between the cutting ring and the eye plate, which is the key to determine the success of direct water cleaning method. If the cutting ring and eye plate wear is not serious, the cutting ring and the eye plate spacing <0.1mm, and no more than 1mm between them trench scratches, available direct water method. 2) After pumping the concrete, pump a slurry of 0.15 ~ 0.25m \ +3 water-cement ratio of 1: 1.5 or 1: 2 and fill the distribution valve with water to start pumping and pump the concrete to Pour the spot until the outlet of the delivery tube flows clear water. If the pipeline is shorter, the cleaning effect is better, then the cleaning process ends. 3) When the pipe is longer or cleaning effect is not good, then open the hopper discharge door, open the anti-pump, the hopper and dispensing valve rinse. If the pump is pumped upwards and the height is> 20m, use a wooden hammer to hit the bend at the bottom of the vertical section. If the knocking sound is low, disconnect the elbow and pour out any large aggregates that may accumulate. 4) Close the discharge door, pump clean water until it reaches the fresh water from the output of the delivery pipe. Direct water method has the advantage of not having to dismantle the material mouth tube and cleaning ball, save time, pumping easier to succeed, especially for the cleaning of shorter pipelines. The disadvantages: â‘ large amount of water and the pump water must be continuous, water is easily ranked at the pouring site; â‘¡ if the pipe is vertical upward, the pipe must usually be detached; â‘¢ longer pipelines when there is a residual pipeline; â‘£ distribution Valve sealing requirements more stringent. 2, remove the material pipe method 1) After pumping the concrete back pump 1 to 2 cycles to eliminate the pressure in the duct. If you pump up, you must close the shut-off valve to prevent concrete from flowing back and then remove the discharge tube. 2) Open the hopper discharge door, anti-pump distribution valve, concrete tank and hopper in the concrete rinse. 3) Remove the first 6B or 5B pipe from the mouth of the concrete and insert it into the soaking ball or cylinder cleaning piston. 4) close the distribution valve discharge door, if there is a stop valve is open, pump water to the piston pump from the pump output so far. The advantage of unloading pipe method is that the pipe cleaning is relatively clean, the flow rate of the water source can be lower, and can be suspended. The disadvantage is that the discharge port again after the disassembly difficulties, laborious. 3, plus the piston method 1) with 10 to 20 cement bags into the diameter slightly smaller than the diameter of the cylinder, the head slightly pointed, about 400mm length of the columnar body, tied with a fine wire, and clean the ball with wire light bar The rear of the columnar, saturated with water. 2) After pumping the concrete back pump 1 to 2 cycles to eliminate the pressure in the pipe, click the button, so that the concrete cylinder piston retreat to the last point. If pumping upwards and shut-off valves must be closed first to prevent backflow of concrete. 3) Remove the discharge tube, open the hopper discharge door, counter-pump distribution valve, concrete tank and hopper in the concrete rinse. 4) Close the hopper discharge door, add water to the hopper, when the water is added to the concrete cylinder diameter 2/3 height, the columnar head toward the distribution valve into the concrete cylinder, with a length of about 1m, a diameter of about 30mm The wooden sledge rod will columnar body, continue to add water to the shaft centerline height. 5) Remove the pry bar, quickly start the pump, add water until the column is pumped out of the delivery pipe. Plus piston method has the advantage of cleaner pipe cleaning, water flow rate can be lower, you can pause, while reducing the demolition of the mouth and the elbow trouble. The disadvantage is the higher operating requirements, the distribution valve easy to cut the columnar body. The above three kinds of concrete pump washing methods have their own advantages and disadvantages, of which the most reliable is the demolition of material pipe method, the simplest is to add piston method, such as the short distance, the direct water method is a good choice. The specific method should be based on the actual situation of construction, in short, to be both effective and economical.
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