Existing building elevator foundation deepening four-wall supporting construction method

The invention relates to an existing building elevator foundation deepening four-wall supporting construction method and belongs to the technical field of elevator reinforcement. The existing buildingelevator foundation deepening four-wall supporting construction method comprises the following steps: statically cutting an opening on an original elevator four-wall position according to a snapped external edge line; drilling holes on the original structural foundation of the periphery of the original elevator four-wall position at mounting column underfoot steel plates; mounting steel columns and steel beams; and carrying out settling observation. Through the formation of the opening on the original elevator four-wall position and through the supporting of the steel beams, the load of the upper part of the elevator four-wall position directly acts on a steel structure supporting system, the layer-by-layer erection of full scaffolding is not needed, and the influence on the constructionor normal use of an upper-