Before concrete pouring, the base, formwork, reinforcement, embedded parts, scaffolding, and various machinery and equipment should be inspected, must be formwork, steel, embedded parts of snow and ice, debris, mud, oil clean.
During the construction of joint concrete, the joint surface shall be heated to a temperature above 5℃ before the new concrete pouring, and measures shall be taken to keep the joint surface of concrete at a positive temperature until the new concrete gains the required frost strength. When there are metal embedded parts and large diameter rebar, the embedded parts and rebar should be heated. When pouring, it should be carried out according to the concrete structure shape, reinforcement arrangement, unloading method and vibration method, etc., and the concrete pouring of the upper layer should be completed before the initial setting of the lower layer or remaking.