1, horizontal brace or diagonal brace includes single pole, truss and splayed brace;
2, cross or inclined plane bar system support;
3, ring rod system or plate system support;
4, vertical brace
According to the specific situation, each type of internal support form generally says that the foundation pit with regular area and shape adopts horizontal support or diagonal support; The foundation pit with large area or regular shape needs cross or oblique plane bar support; Compared with the excavation space, circular, rectangular and nearly circular foundation pits can be supported by annular bar system or annular plate system; When using vertical support in shallow and large foundation pit, it is necessary to pay attention to setting support foundation and installing support structure before vertical support, which should meet the requirements of bearing capacity and overall stability of deformation.
All kinds of support structures should pay attention to the overall stiffness cloth of the support system to avoid sudden changes, so as to maintain the horizontal force and support stiffness as much as possible.