1. The foundation is cast on-site, the foundation pit is excavated manually, and rock sections unsuitable for manual excavation are drilled with jackhammers or pneumatic guns to create shallow holes for weak blasting. The upper soil pit wall is sloped, while the lower rock pit wall is vertical.

Excavation slopes of the foundation pit vary according to the site conditions, and the pit dimensions should accommodate the pit outline. Prior to the installation of concrete foundations, promptly inspect the pit dimensions, the flat position, and the ground levelness and compactness, followed by the commencement of foundation construction.

Prior to pouring concrete for the foundation at the 3rd base, an engineering inspection of the foundation pit was conducted. The inspection included: 1. Verification of the base's plane position and elevation against regulatory requirements. 2. Confirmation of the soil type matching the specifications and its load-bearing capacity meeting the standards. 3. Assessment of any water accumulation, debris, loose soil, and the cleanliness and levelness of the base.

4 Base Treatment: When the base is dry soil, it should be moistened. The process soil should be compacted with a layer of gravel below the base design elevation. If the base surface is rock, moisten it, spread a layer of cement mortar, and carry out the foundation concrete work before the mortar sets.

Once the initial excavation for the 5 basic concrete foundation is complete, it should not be left exposed for an extended period. The concrete foundation should be poured as soon as possible, ensuring its position, stability, and elevation: the column concrete foundation dimensions are 400mm x 300mm x 300mm.