The process of construction method is as follows: leveling the site → mud preparation → burying the casing → laying the working platform → installing mechanical equipment and positioning → drilling → cleaning the hole and checking the quality of the hole → lowering the reinforcing cage → pouring underwater concrete → pulling out the casing → checking the quality.
The depth of the conduit buried in concrete should be 2 ~ 6m. It is forbidden to lift the catheter away from the concrete pouring surface, and the speed of lifting the catheter should be controlled. There should be a special person to measure the buried depth of the conduit and the elevation difference of the concrete pouring surface inside and outside the conduit, and fill in the underwater concrete pouring record.
Extended data:
The sand content of underwater concrete should be 40% ~ 50%, and medium and coarse sand should be selected; The maximum particle size of coarse aggregate should be less than 40mm；; And should meet, coarse aggregate can choose pebbles or gravel, aggregate particle size shall not be greater than 0/3 of the minimum spacing between reinforcement.
Before pouring, the garbage, dirt, oil stains and other sundries in the template should be removed, and whether the cement mortar pad and plastic pad of the steel bar are well padded should be checked. If wooden formwork is used, it should be watered to make the formwork wet. After removing sundries and accumulated water, close the column template cleaning mouth.
The virtual paving thickness of pouring slab should be greater than the slab thickness. Drag and vibrate along the pouring direction with an internal vibrator, check the concrete thickness with an iron ruler, and smooth it with a long wooden trowel after vibrating. Construction joints or embedded parts and steel dowel shall be leveled with wood trowel. When pouring floor concrete, it is not allowed to spread concrete with vibrating rods.
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