Any construction starts from zero cycle. These works are connected with the digging of a foundation pit, which, along its perimeter and depth, can be of impressive size. A pit located in the city center or in close proximity to water bodies requires a reliable fencing that can protect against soil shedding, landslides and erosion.
In addition, such a fence will serve as a guarantee of the safe conduct of all necessary types of work, primarily related to the construction of the foundation. Today, to solve this problem, sheet piling is used using four different technologies: the “wall in the ground” structure, tangential piles, impervious curtains and bored secant piles. Each technology used to produce sheet piling has its advantages and disadvantages, and the choice directly depends on the expected loads on the fence, geological featuressoil and pit depth.
One of the most versatile and progressive technologies used for sheet piling of excavations is considered to be a “wall in the ground”. This is the best option for the construction of underground structures that are being built in open pits. Today, there are three main types of walls: impervious, enclosing and bearing. In addition, sheet piling "wall in the ground" differs in materials used for the construction of the building envelope: prefabricated-monolithic, prefabricated and monolithic.
The sheet piling of the excavation using the "wall in the ground" technology is carried out in several main stages: the development of a trench with the installation of a reinforcing cage, the filling of the trench with a concrete mixture of the required grade, the development of soil in the central part of the structure, the installation (if necessary) of spacer structures and at the final stage - the device of the bottom of the internal structures.
Soil wall sheet piling allows construction:
- in areas where groundwater levels are high;
- with a complex shape of structures and its large size in plan;
- with a depth of structures over 50 meters;
- in close proximity to functioning buildings of any purpose.
Soil wall sheet piling can be used in any dispersed soil. The only exceptions are quicksand and flowing clay soils. In addition, suchfencing is not recommended in areas where groundwater has a high filtration rate. The passage of soils that have solid inclusions of man-made or natural origin is possible only with the use of special equipment equipped with a milling cutter. Prefabricated-monolithic and prefabricated technologies have the highest productivity in carrying out work on the installation of sheet piling. The vertical moving pipe method is applied when using monolithic sheet piling technology.
