The construction technology of mixe

The construction technology of mixed use of step foundation construction, strip foundation construction and large volume foundation construction is the content of building foundation construction. The construction of stepped foundation can realize the pouring operation according to the distribution of the steps. In order to ensure the seamless pouring, if the foundation pile is cup-shaped, not only should the cup-shaped formwork maintain the horizontal height during the pouring process, in addition, the concrete should be vibrated and compacted continuously and rapidly in the pouring process. In the construction of Strip Foundation, the length of the foundation is longer than the width of the foundation, the elevation line of the two ends of the foundation formwork can be marked before the construction, and the concrete placement can be carried out by the method of layering and sectioning, to ensure the quality of pouring. The large volume foundation construction is mainly used in the large volume concrete pouring whose geometric size is higher than 1m. Although the large volume pouring is realized, the boundary force will be produced because of the large section area and the plane structure, which in turn leads to pouring cracks. In order to prevent the occurrence of cracks affecting the quality of construction, the application of secondary vibration and layered and subsection pouring technology is very important. The vibration time should be determined according to the factors such as cement type, climate temperature and concrete type. The secondary vibration technology can not only reduce the cracks in the concrete internal structure, but also enhance the stability of the structure, the compressive and cracking strength of the whole concrete structure is increased by about 15% .