Grading is carried out according to the requirements of the specification. The excavation of the foundation pit (trough) is excavated in layers from top to bottom. The depth of each layer should be about 60cm. The foundation trench can be excavated in three times.
According to the specification requirements for grading, the base pit (slot) excavation from top to bottom layer excavation, each layer depth of about 60cm is appropriate, the base groove can be divided into three excavations in place.
According to the requirements of the specification, the foundation pit (groove) shall be excavated in layers from top to bottom, and the depth of each layer shall be about 60cm. The foundation groove can be excavated in place in three times.<br>