Manual placing boom Concrete Placement Application

1, after pouring is completed, check whether the reinforced concrete surface contamination, and promptly cleaned. Just after the above requirements will be able to ensure the quality of the operation of pouring concrete.
2, should be stratified pouring concrete segments, each pouring height should be determined according to the structural characteristics and reinforced density conditions. Vibrators generally stratification height is 1.25 times the length of the active portion, the maximum does not exceed 500 mm; layer thickness of the plate vibrator 200 mm.
3, start the vibrator, vibrating hand holding the upper end of the shaft vibrator hose, quickly insert inside the concrete, when vibrators, vibrator up and down slightly twitch, vibration time is 20 to 30 seconds, but no concrete placing boom surface bubbles, no significant subsidence, surface and the surface of the horizontal pan-pulp prevail. Use vibrators should do push-pull slow, evenly interpolated point to point by point move, according to the order can not be missed, so that even the tap. Mobile spaced not more than 1.5 times the radius of action rods (typically 300 ~ 400 mm), close to the template distance of not less than 200 mm. The vibrator should be inserted into the lower layer of the concrete surface 50 ~ 100 mm, in order to eliminate the seam between the two layers. Moving pitch flat plates vibrator should be able to guarantee cover vibrator has tapped part of the edge.
4, pouring concrete machinery should be carried out continuously. If it is necessary intermittent, intermittent time it should be as short as possible and should be before the initial setting of concrete front layer, the second layer of concrete pouring is completed. The maximum time interval should be all varieties of cement and concrete to determine the initial setting of conditions, usually more than two hours should be construction joint.
5, should send someone pouring steel template frequently observed, reserved holes, embedded parts, dowels, etc. Have displacement deformation or blockage, identify problems and should be watered immediately trimmed completed before the initial setting of concrete has been poured.