Pay more attention to watering, which is also commonly known as health preservation. ?
The specific form removal time is as follows:
1, the formwork removal time for beam slab bottom formwork with span less than or equal to 8m and suspended beam with span less than or equal to 2m is: when the daily average temperature is 5 degrees, the formwork removal time is 20 days; When the daily average temperature is 10℃, the demoulding time is 14 days; When the daily average temperature is 15℃, the demoulding time is 1 1 day; When the daily average temperature is 20 degrees, the demoulding time is 8 days; When the daily average temperature is 25 degrees, the demoulding time is 7 days; When the daily average temperature is 30 degrees, the demoulding time is 6 days;
2. The bottom formwork removal time of cantilever beam and beam slab with a span of more than 2M is: 50 days when the daily average temperature is 5 degrees; When the average temperature of the day is 10℃, the demoulding time is 40 days; When the average temperature of the day is 65438 05℃, the demoulding time is 30 days; When the daily average temperature is 20 degrees, the demoulding time is 28 days; When the daily average temperature is 25 degrees, the demoulding time is 20 days; When the daily average temperature is 30 degrees, the time for form removal is 18 days.
Extended data:
Precautions:
The following items should be paid attention to when pouring concrete for frame columns:
Before concrete column pouring, formwork, reinforcement, embedded iron holes, etc. The part to be poured must be inspected and accepted, and the next step of construction can be carried out only after it is qualified.
When each column is fired for the first time, a layer of cement mortar with the same composition as the concrete should be laid at the bottom of the formwork before pouring concrete, with a thickness of 50-100 mm.
When the pouring height of the column is less than or equal to 3m, the section size of the column is greater than 400mmx400imn, and there is no cross stirrup, concrete can be poured directly from the top of the column; When the column pouring height is greater than 3m, the string tube can be set for blanking, as shown in Figure 3- 16. Concrete must be poured in sections, and the pouring height of each section shall not exceed 2m.
When the cross-sectional size of the column is less than 400mmx400mm or there are cross stirrups, watering holes should be opened on the side of the column template, and chutes should be installed at the holes for blanking, and pouring should be carried out in sections, and the height of each section should not be greater than 2 m.
If there are stirrups at the mouth of the cave, you can untie the knot temporarily, move the stirrups up temporarily, and then return to the original position when sealing the hole after pouring. After the hole is closed, a clamp should be added to fix the hole template. When the chute is used for blanking, it can be shaken gently to speed up the blanking.
When pouring a row of columns, the columns should be pushed symmetrically from both ends to the middle, and the steel bars can be pushed from one end to the other to prevent the concrete columns from tilting to one side or even collapsing ("pushing nine rows").
When concrete is poured to the top of the column, a thick layer of cement mortar often appears at the top, which will affect the structural strength of concrete. To this end, a certain number of clean stones with the same particle size can be added to the mortar and then vibrated.
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