1. The gradation of concrete in the groove section of this project not only meets the requirements of structural strength, but also meets the requirements of underwater concrete construction, with good workability and fluidity. The slump of concrete shall be 180mm ~ 220mm.
csmConstruction method of concrete
1The gradation of concrete in groove section of this project not only meets the requirements of structural strength, but also meets the requirements of underwater concrete construction, with good workability and fluidity.The slump of concrete shall be180mm～220mm.
2When two catheters are used simultaneously in the same slot, the spacing should not be greater than3m, the distance between the conduit and the slot joint should not be greater than1.5m. At the beginning of perfusion, the distance between the bottom of the catheter and the bottom of the trough should not be greater than500mm; The concrete surface should rise evenly, and the height difference of the concrete surface at each conduit should not be greater than0.5m, the concrete shall be perfused before final setting.
3, concrete perfusion using conduit method construction, conduit selectionD=250The round spiral quick connector type. The pipe is hoisted into the specified position of the groove section with a concrete casting frame, and a square funnel is installed on the top of the pipe.
4, the rising speed of the concrete surface shall not be less than2.0m/h, the depth of the catheter embedded in the concrete should be2～6m.
5The slump should be tested before concrete pouring, and the concrete test block should be done in the pouring process: During the construction of diaphragm wall, compressive strength specimens shall be made for each unit groove concrete section1Each group,5The groove section shall be made of impermeable pressure specimen1Group, and make a good record.
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