Structure for preventing water in permafrost from gathering at foundation pit by using water shield boxes

The utility model relates to a structure for preventing water in permafrost from gathering at a foundation pit by using water shield boxes. The structure is characterized in that pit holes are dug around a designed foundation pit to bury the hollow water shield boxes which are open upwards to be communicated with the outside but are closed all around; the bottoms of the hollow water shield boxes are as deep as 10 to 50 cm under the depth limit of the permafrost table and are tamped down; and the distance between the buried plane and an edge of a foundation pit to be dug is 0.5 to 5 m. The structure brings frozen walls constructed by the hollow water shield boxes around the foundation pit into play by fully utilizing natural cold energy in a permafrost region during construction in winter, and prevents a large quantity of water in frozen layers from gathering at the foundation pit, thereby continuously reducing the temperature of the permafrost around the foundation pit and further ensuring the stability of th