The basement wall crack generation and crack of mass concrete of foundation of reason have in common, namely, the concrete in the hardening process due to loss of water will produce shrinkage strain, produced in the cement hydration heat temperature reached the highest point after the cooling process will produce strain and temperature. But it has its own characteristics:

One, the wall is foundation, the external floor by the basement exterior wall of great constraint, this constraint is far greater than the pile foundation on the basis of the constraints, resulting in a large probability of running through the cracks.

Two, interior wall panels and floor by the greater impact of environmental temperature. Three is inside and outside temperature difference is small, the probability that produces surface crack is small. Four is the difficulty of curing, fast heat, cooling rate, difficult to use concrete relaxation creep strengths, sudden changes in temperature season especially should pay attention to.

In the calculation of the maximum tensile stress in the plate can still use the formula, but there are several points should pay attention to:

1) H to take L, 0.2L for the whole length of the cast;

2) Cx value should be greater than 1.5N/mm3 because the connection site has a strong steel bar constraints;

3) calculating temperature difference delta T, it is necessary to consider the floor and the wall (doubles as a supporting condition close to the soil, affected by the environmental temperature, and was constraints on their wall and the surrounding floor in the construction process of basic with the outside temperature changes synchronously.

4) if floor panel construction interval is too long, wall that doubles as an enclosure, in the calculation of concrete shrinkage should pay attention to body constraint and constraint of systole different, shrinkage is not the same.