Contents of pile foundation engineering inspection

The contents of pile foundation engineering inspection include not only the location, size, distance, quantity and type of piles, the selected construction machinery, pile site energy, site conditions and engineering requirements, the geotechnical properties, buried depth and fluctuation of the bearing stratum of pile foundation, and the depth of the pile tip entering the bearing stratum, but also the strength, deformation and geometric stress of pile foundation, especially the former.

Pile foundation strength

The strength test of pile foundation includes structural integrity and bearing capacity test of pile body. The structural integrity of pile body refers to whether there are construction defects such as broken pile, necking, segregation, mud inclusion, holes and thick sediment. , commonly used acoustic transmission method, dynamic testing method and core drilling method. Static load test is the most traditional and effective method to detect the bearing capacity of piles. Although this method is time-consuming and expensive, it is still widely used in engineering practice.

Pile foundation deformation

The deformation of pile foundation needs long-term settlement observation to obtain reliable results, and the settlement of pile groups under long-term load shall prevail. As long as the structural integrity and bearing capacity of the pile meet the requirements, the pile tip reaches the design elevation and the soil layer does not rise too much, it can be considered as meeting the design requirements. However, settlement observation must be carried out for important projects.

Geometric stress condition

The geometric stress condition of pile refers to the control of pile position, pile inclination, joint situation, pile top and pile tip elevation. In soft soil areas, the displacement or floating of piles caused by piling or foundation pit excavation often occurs, which should usually be controlled by strict pile foundation construction technology. When necessary, the influence of soil deformation, pore water pressure and pile sinking on adjacent projects should be observed.