Structure construction
1, concrete water cement sand stone ratio is not correct, caused by the plate and beam crack.
2, concrete pouring concrete already had the initial setting time.
3, pouring interrupted for a long time, the formation of the construction of cold joints.
4, when pouring vibration is not enough or super vibration, the formation of concrete capillary porosity.
5, pouring concrete (general toilet to take down board 300), the beam plate at the same time, in the lower part of the beam (above the board) appears hanging hole.
Support the wooden beam side 7, support of the toilet when pouring not immediately removed, in the plate, the hole formed.
8, the stirrups placed directly on the end plate, coupled with the upper surface exposed steel, steel corrosion, and the formation of water leakage.
9, due to the falling plate, the workers often make the mistake of making the steel can not be placed, so the forced bending down, resulting in the root of the lower beam side of the plate to form a long strip, so easy to crack mouth.
10, the template is premature, maintenance is not timely or not enough, the board to form a crack.
Two, building construction
11, the leveling layer before construction is not clean.
12, the leveling layer is too thick, cracks.
13, the leveling layer did not find slope or sloping enough to form water.
14, waterproof layer is not completely closed, due to the material quality is not qualified or construction quality is not good, there are holes and cracks.
15, waterproof layer before the construction did not do fillet.
16, waterproof layer on the bottom of the height is not enough, according to the specification for the anti 150mm, and to achieve a good waterproof effect should be at least on the anti 1000-1200mm.
17, metope waterproof not to do or the construction quality is not qualified.