Civil air defense underground tunnel plugging structure and construction technology

The invention relates to the field of old civil air defense tunnel maintenance and disposal construction, and discloses a civil air defense underground tunnel plugging structure and a construction technology.The civil air defense underground tunnel plugging structure comprises a civil air defense tunnel main body arranged underground, a plurality of construction holes are formed in the top of a civil air defense tunnel in a penetrating mode, and construction pipes are inserted into the construction holes and inserted into the civil air defense tunnel main body; expansion air bags are arranged on the construction pipe and abut against the inner side wall of the civil air defense tunnel body, a filling cavity is formed between every two adjacent expansion air bags, a plurality of water pumping holes and a plurality of material injection holes are formed in the top of the civil air defense tunnel body, and the water pumping holes and the material injection holes communicate with the filling cavities. A water pum