Steel pipe pile can be used under the following conditions

1) Basic engineering of general industrial and civil buildings (structures) in areas where the seismic fortification intensity is not greater than 7 degrees. When used in areas with seismic fortification intensity of 8 degrees, it is only suitable for thin medium- and below-thick liquefied soil sites and multi-storey buildings (structures) with a structural height of no more than 24m.
2) The low-cap pile foundation that is mainly subjected to vertical compression. When it is used as a pile foundation project that mainly bears vertical tension and horizontal load, it should be designed separately according to the specific situation.
3) Pile foundations for multi-story and high-rise buildings (structures) with a height of no more than 80m.
4) Plain fill, miscellaneous fill, silty soil, silt, cohesive soil, slightly dense and medium dense sandy soil and other sites.
5) Slightly corrosive and weakly corrosive sites; under special circumstances, if pipe pile foundations are required for moderately corrosive sites, anti-corrosion design should be carried out based on local experience.
6) Pipe pile foundation projects with a design life of 50 years or less.

Steel pipe pile should not be used under the following conditions

1) The covering layer above the pile end bearing layer contains a hard interlayer that is not suitable for the pile end bearing layer and the steel pipe pile are difficult to penetrate.
2) Sites where the steel pipe pile are difficult to penetrate, the rock surface is shallowly buried, and the slope is large.
3) The pile tip bearing layer is covered with a thicker soft soil layer (such as silt, silty soil, under-consolidated soil, loose fill, etc.); or there is a thicker medium and above liquefied soil within the effective pile length Layers of the site, and the pile ends are directly supported on the moderately weathered and lightly weathered rock; or the moderately weathered rock face has only a thin and strongly weathered rock layer.
4) The pile tip bearing layer is a weathered rock layer that is easy to soften in contact with water and is shallowly buried.
5) The surrounding ground of the pile foundation of the soft soil foundation bears a large range of ground pile load or a pile foundation project that bears a large local horizontal load.
6) A karst site with no suitable bearing layer on the bedrock surface.
7) When the pipe pile sinking construction has a serious impact on the surrounding environment.

Steel pipe pile should not be used under the following conditions

1) Sites where groundwater or site soil has a strong corrosive effect on the concrete, steel bars and exposed iron parts of the steel pipe pile.
2) The overburden layer above the pile end bearing layer contains many obstacles (such as boulders, boulders, etc.) that are difficult to remove and seriously affect pile sinking, or hard interlayers (such as hard plastic clay layers, dense Sand layer, etc.).
3) High-rise buildings whose seismic fortification category is special fortification (Class A).
4) Foundation works that are located on slopes, shores, and liquefaction extension areas that are subject to relatively large horizontal loads.