It is also known as the extended base, which applies to shallow areas where the ground is more solid and where the current is less severe. Its base earth mass and ground-based carrying capacity must meet the design requirements and must be strictly protected from disturbance, and the base pits should, as far as possible, be scheduled for work during the less rain season。
I. Clarifying basic construction processes
Clear basic construction process
Element 1. Process control
Clarify basic construction control points — process control
The stability of the slope of the base pit should be monitored when it is dug. In addition to construction in accordance with the principle of first-aid and then-drilled deep-ground pits, sediment monitoring around them is required。
When the substrate does not meet the requirements, the base treatment shall be carried out, inter alia, by exchange of soil, squeezing of pillars, sand wells, bagging of sand wells, pre-pressure reinforcement of the foundations, strong incubation, electron seepage, vibration of water impulses, deep-drying of pillars, high-pressure slurry injection, chemical solidifiers, etc。
Concrete should be made from 30 to 45 cm thick in layers, with the upper concrete being filled before the first concrete in the lower layer or before it can be remodelled. When concrete is located at a height greater than 2. 0 m, a cylinder or sluice is installed. Vibration is carried out by an insert-in vibrate, and collisions with steel bars and models are strictly prohibited during the vibration。
Quality control
Clarifying basic construction control points — quality control
Underground water table excavation must be carried out with targeted measures, such as geological information on projects with fine sand dust and coarse sand layers, and measures to effectively prevent drifting sands, such as cutting water and precipitation。
The main elements of the substrate tests include: checking the location, size and height of the substrate; checking the physical homogeneity of the substrate, the stability of the ground and the carrying capacity; and checking the treatment and drainage of the substrate。
3. Control of security civilization
Clear-cut basic construction control points — safety civilization control
The security fence around the top of the base pit is continuously closed to prevent personnel from falling。
The base pits should, to the extent possible, be scheduled for construction during the less rainy season. During construction during the rainy season, in addition to drainage facilities around the base pits, a rain shed should be set up to prevent the base pits from pouring water。
In the construction work, care was taken to observe whether there were cracks on the top of the pits and whether the pit walls were loosely collapsed。
The disposal of the soil shall be regulated and its location shall be planned in a uniform manner and not at will。
Iii. Photos of the basic construction site
Photos of the basic construction site
