Pipe jacking well deep foundation pit excavation and supporting construction technology

The invention discloses a pipe-jacking well deep foundation pit excavation and support construction process, which relates to the field of foundation pit protection and comprises the steps of earth excavation, first layer excavation, ring beam and layer wall plate construction, gradual excavation of each layer and ring beam and layer wall plate construction of each layer, waterproof treatment of the bottom of a foundation pit, bottom plate pouring and backseat wall construction. The intercepting ditch and the water collecting pit structure are arranged on each layer, so that no accumulated water is reserved in the foundation pit, and underground water is prevented from flowing into the foundation pit in the later period by conducting waterproof treatment on the bottom of the foundation pit. 本发明公开了一种顶管井深基坑开挖及支护施工工艺，涉及基坑防护领域，包括土方开挖、第一层挖掘、环梁及层壁板施工、各层逐步挖掘及各层环梁及层壁板施工、基坑底部防水处理、底板浇筑、后座墙施工。本发明通过在每层设置截水沟和集水坑结构使基坑内无积水存留，通过在基坑底部做防水处理，避免后期地下水涌入基坑。