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In the excavation of foundation pit enclosure excavation and support erection is alternate construction, follow the principle of first support and then excavation in the inner support construction, which many students have different opinions, because he believes that the foundation pit is excavated first, excavated to the support position and then carried out the construction of support, and the support erection is completed and accepted after continuing to excavate and support the construction downward, according to this construction sequence, it should be excavated first and then supported. In fact, the first support and then excavation refers to the foundation pit earthwork excavation to the support top elevation position when the excavation is stopped for the internal support, and the internal support establishes the support system and then continues the earthwork excavation, the reason why the excavation to the support top elevation position is to reduce the distance between the excavation and the brace, but in the actual construction, for the convenience of construction, it is often excavated to the bottom elevation of the support. Foundation pit earthwork excavation to the design document specified in the position of 0.5m under the internal support, this sentence makes this knowledge point more confusing, as a candidate for a municipal administration, we do not need to argue in accordance with what principle of excavation, what we have to do is to master these two knowledge points, the examination of multiple choice questions can be correct, case questions can be written on the answer sheet, so we understand that the foundation pit earthwork excavation to the support top elevation position to stop excavation, and then at the support position of the groove excavation 0.5m down to ensure the support of the working face, support construction is completed and continue earthwork excavation after acceptance
