Pouring concrete placing booms requirements

Boom concrete pump and process with the use of some of the requirements to ensure that concrete pouring scope thickness.
 
In the concrete pouring requirements are: 1. concrete bucket mouth from falling freely pour down height shall not exceed 2m, measures to be taken if more than 2 m. Should string tube, a catheter, or chute opened the door in the side of the hole template (green port). 2. pouring concrete segments should be stratified, each pouring height should be determined according to the structural characteristics and density steel case. Vibrators generally stratification height is 1.25 times the length of the active portion, the maximum does not exceed 500 mm; thickness of the layered plate vibrator is 200 mm. 3. start vibrators, vibrators hand holding the upper end of the shaft vibrator hose, quickly insert inside the concrete when vibrated, vibrating rod twitch up and down slightly, vibration time is 20 to 30 seconds, but no longer to the concrete surface bubbles, no significant subsidence, surface pan paste and surface level prevail. Use vibrators should be done slowly push pull, plug points should be uniform arrangement, point by point move in sequence, to be omitted, so that even the tap. Mobile spaced not more than 1.5 times the radius of action of the vibrator (typically 300 ~ 400 mm), the template close distance of not less than 200 mm. On vibrated concrete surface layer should be inserted into the lower 50 ~ 100 mm, in order to eliminate the seam between the two layers. Moving pitch plate vibrator should be able to guarantee cover plate vibrator tap has been part of the edge. 4. The pouring of concrete should be carried out continuously. If it is necessary intermittent, intermittent time it should be as short as possible and shall before the initial setting of the first layer of concrete, the sub-layer concrete pouring is completed. The maximum time interval should be all varieties of cement and concrete to determine the initial setting conditions, generally more than two hours should be construction joint. 5. send someone should be pouring steel template frequently observed, reserved holes, embedded parts, dowels, etc. Have displacement deformation or blockage, identify problems and should be trimmed and watered immediately before completion of the initial setting of concrete has been poured. 6. When finished pouring, check whether reinforced concrete surface contamination, and promptly cleaned. Just after the above requirements will be able to ensure the quality of operations boom pouring concrete.