News Abstract: in the construction of basement leakage stoppage, the post cast strip is usually reserved in the underground structure due to the needs of engineering construction, and the leakage often occurs at the joint of concrete on both sides of the post pouring belt.
Because of the need of engineering construction, the post pouring belt is usually reserved in the underground structure, and the leakage often occurs at the joint of concrete on both sides of the post pouring belt.
Generally, the construction time of the post pouring belt in the basement plugging is 6 weeks after the concrete on both sides is formed, and the shrinkage deformation of the concrete is basically completed, or through the settlement observation. When the settlement on both sides is basically the same, the load increase of the upper structure and the duration of concrete pouring of the lower structure are determined.
According to the characteristics of dense reinforcement, T-shaped shape should be adopted in the construction of post pouring belt for leakage stoppage in basement, so as to facilitate the removal of formwork. When erecting the suspended formwork, the reinforcement supporting the formwork must be cut off from the middle, so as to prevent the reinforcement from becoming a water seepage channel. Before construction, the joint surface should be carefully cleaned with wire brush. It is better to chisel off the surface mortar layer with a chisel, so that the fresh concrete can be completely exposed before pouring. During the construction of the post pouring belt for leakage stoppage in the basement, the plain cement slurry can be applied again on the joint surface according to the concrete pouring speed, but the advance amount of each painting should not be too long, so as to avoid losing the function of the binding layer.
15% U-type expansive agent can also be added into the post cast strip concrete to compensate the shrinkage when the concrete hardens. The secondary vibration method should be used in concrete pouring to improve the compactness and bonding force of the interface. The reinforcement of this part is often strengthened in the design.