Building and construction process of pumping concrete: prepare pumping concrete prior to pumping, mix as well as transport, and also clean the pipe for healing after pumping.
- Prep Work Prior to Pumping
(1) During building in warm seasons, the concrete delivery pipeline shall be covered with a wet blanket or a damp straw bag to cool off, so regarding stay clear of sunshine and also raise the downturn.
At the same time, spray water at regular periods to lower the mold temperature; Throughout construction in reduced temperature level, it is required to cover or cover with thermal insulation products.
(2) Execute an extensive examination, as well as start the equipment for trial run after meeting the demands. After the pump starts, pump a correct quantity of clean water to damp the receptacle and piston.
As well as shipment pipeline and various other components straight contacting with concrete. The concrete pump as well as delivery pipe shall be oiled with concrete mortar with the very same mix proportion as the pumped concrete.
(3) Inspect whether the laying of the transmission pipe is reasonable and firm; Whether the lighting as well as water source can be made use of generally.
- Pipeline Laying On Site
(1) It is much better to choose the shortest route as the transmission pipe. Bend and also pipe will be made use of as little as possible in the pipeline, and also elbow and pipe with excessive flexing will be prevented.
The versatile pipe at the end area shall not be curved more than 180o and also will not be turned.
(2) The upright conveying pipeline shall be repaired at the scheduled opening of the wall surface, column or flooring with embedded components or wedged with wooden wedges. A minimum of one pipeline will be set on the wall surface as well as column set factor; The straight pipeline shall be fixed with braces at specific periods, and also the much shorter the horizontal pipe, the much better.
(3) The bend below the upright pipeline near the bottom shall be individually given with a fixed center to bear the weight of the pipe.
- Mixing of Pumped Concrete
(1) The quality of different resources of concrete will meet the mix design needs. When blending pumped concrete, different resources will be measured.
(2) The mixing and also feeding series of concrete is concrete and also fly ash, stone and also sand, water and admixture. Admixtures shall be included later than water and cement.
(3) The minimal mixing time of pumped concrete is 1min; When admixtures are added, it will be extended for 1 ~ 2min; The maximum mixing time must not surpass 3min.
After the concrete blending operation of one mix percentage is completed, the blending drum of the concrete mixer shall be extensively cleaned to drain pipes the collected water.
- Transport of Pumped Concrete
If problems permit, the concrete shipment pump can be put under the electrical outlet of the mixer, getting rid of the transport web link. When concrete have to be delivered, concrete mixer vehicle will be utilized for transport. During the transportation, the mixing drum of the car will turn at a slow rate of 3-6r/ minutes. The transportation period is not easy to go beyond 1/2 of the first setup time of concrete. Before feeding, revolve the blending cylinder at medium as well as high speed to make the concrete mix uniformly.
- Concrete Pumping
(1) When pumping, slow down initially, and also check whether all parts of the pump operate generally and whether the transmission pipeline leaks slurry and is firm. Begin to increase to the normal speed nevertheless systems operate typically.
(2) If the pumping need to be interrupted somehow, the disturbance time will not go beyond the permitted time from mixing to the completion of putting.
(3) When pumping concrete, if air is drawn into the distribution pipe due to the failure of concrete supply or various other factors, the concrete in the pipe shall be immediately pumped out.
The dirt will be remixed in the hopper as well as pumped once more after the air is discharged.
(4) When the concrete is transferred to the pouring area, it will be poured into the formwork right away. If the concrete mix is separated or layered, the concrete shall be mixed. The product will be stirred twice.
(5) After pumping, the concrete in the concrete pump shall be cleansed and the pump as well as delivery pipe will be cleaned up.
- Treating of pumped concrete members.
Efficient curing procedures shall be taken after concrete pouring or very long time construction of mass concrete. It is purely prohibited to reveal the concrete to the sunlight for a long period of time, so that it will certainly split and shed water prematurely and influence its strength. It ought to be noted that:
(1) The concrete shall be covered and preserved with dampness within 12 hrs after the conclusion of concrete pouring.
(2) When the temperature level is lower than 5, thermal insulation and treating steps will be taken, and straw bags or sacks will be covered on them. Currently, watering for curing is purely restricted.
(3) Time for concrete watering and curing: for concrete blended with Portland concrete, common concrete or slag concrete, it shall not be less than 7 days; For concrete with admixture or impermeability requirements, it will not be less than 2 week.
(4) The sprinkling times shall be able to maintain the concrete in a moist state, and also the healing water will coincide as the mixing water.
(5) The revealed surface of the concrete covered with plastic towel shall be snugly covered, and the interior will be kept with condensed water.