Check the location, plane dimensions, and pit bottom elevation of the foundation pit

Check the conditions of rock, soil and groundwater at the bottom and sides of the pit

Check the conditions of caves, ancient wells, ancient tombs, underground ditches, underground structures and air defense bunkers, etc.

Check the soil disturbance at the bottom of the pit and the scope and extent of the disturbance

Check whether the bottom of the pit has been disturbed by freezing, cracking, water erosion or immersion

When the pressure-bearing water head is higher than the ground level of the foundation pit, sounding may cause water and sand to flow out.

The supporting layer of the foundation pit is a gravel or pebble layer and the thickness below the base is greater than 1m.

The basic bearing layer is a uniform and dense sand layer with a thickness greater than 1.5m.

Foundation uniformity and compactness

Pile head, pile position, soil condition between piles, construction quality inspection report

Collapsibility, earthquake liquefaction, soil moisturizing, expansive soil moisturizing

Soil conditions at the tank wall and bottom

Is the slope of the foundation trench stable?

Are there old house foundations, caves, ancient wells, buried pipelines and civil air defense facilities in the foundation trench?

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