Susceptible Columns MSC
Foundation of warehouses, small residential buildings, parking structures and different kinds of flooring force us to look for new soil improvement technologies, which not only provide design conditions, but also allow for fast and economical implementation of small structures. Menard Susceptible Columns improve soil, which results that are and more often they become a powerful addition to concrete, gravel, cement or lime column technology.
MSC columns for soil improvement, belong to the group of displacement technologies. This means that during forming the column core, soil is not extracted to the surface, but displaced horizontally towards the hole centerline. To make MSC columns, the most commonly used are specifically adjusted steel pipe, which is connected at the hardware unit junction with a tool which generates vertical vibrations. Tool weight, vibrations and pressure of the machine result in sliding down the pipe at the planned depth. Once the pipe has reached the desired level, the tool is hoisted up while pumping properly selected grout. The result is a composite of the soil and columns, operating as a homogeneous structure with enhanced bearing capacity. The column process of column implementation does not cause any damages to the area, and the low-frequency vibrations generated in a vertical plane do not affect the construction of buildings even when the works are carried out in a compact development. Work efficiency comes to a few hundred running meters per work shift. During the MSC implementation process, the following parameters of the column are registered: the depth of MSC placing, the consumption of grout and power consumption of the vibrator. Active analysis of these readings allows us to control the quality of column installation and to verify the soil conditions on the concerned site.
MSC column technology has a very broad and economically justified use when we have to work with cases of layers of organic soil (eg. peats, aggregate mud, gyttjas) and cohesive soils with a degree of plasticity IL> 0.6 of a thickness up to 6.0 m. Due to the possibility of installation of a.m. columns on a very dense grid, this method is applicable in soil improvement under the floors in large-surface buildings, warehouse halls and sales floors as well as useful for different types of foundation slabs allowing for their cost-effective reinforcement. It is also used to improve soil under parking lots, walking routes and roads, particularly, when we are dealing with very low banks or inability to construct an appropriate transmission layer.
As a load-carrying medium of a colum shaft, it is used carefully compound grout (cement, lime, cement-lime with ash and chemical additives, or cement-sand/cement-lime-sand mix), the parameters of which are selected in line with the design requirements. The column shaft has a minimum diameter od 0.15 m to 0.30 m depending on the condition of improved soil and their lateral vulnerability. The most frequent column spacing ranges from 1.0 m to 2.5 m, using rectangular or triangular arrangement.