METHOD OF COMPRESSING SOIL AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2008 - IPC E02D3/12 

FIELD: construction.

SUBSTANCE: invention pertains to the field of construction, more specifically to the technology and equipment of compressing soil during construction of buildings and during renovation and reconstruction of already existing structures on dispersive binding or non-cohesive soil, as well as on piled (industrial) soil and slide slopes. The engineering problem of this invention is broadening of features due to compression of not only dispersed binding soil - clay, loam soil, sandy loam, but also non-cohesive dispersed soil - sand, as well as piled (industrial) soil due to the mode of infusion of mortar into soil with a chosen quality characteristic of the mortar, providing for its high penetrative capability, as well as use of media, providing for constructing soil structures reinforced by a common frame made from hardened mortar. In this case, there is increased bearing strength of the soil, effective holding in the soil structure of slide slopes with formation of a frame in it, as well as increased rate of production. This is achieved by that, the technique of compressing soil involves infusion of cement mortar through injectors in the form of perforated pipes with simultaneously opening caps on the perforations, achieved through a concrete slab on non-cohesive soil in the form of a tightening weight or tightening weights mounted on it, with hydraulic fracturing of the soil at hydraulic fracturing pressure between 3.0 and 20.0 atm. After hydraulic fracturing of the soil using cement mortar, there is compression of the soil by way of widening the fractures of the hydraulic fracturing due to infusion of the cement mortar. Infusion of the cement mortar for widening the fractures from hydraulic fracturing can be achieved continuously in pulsed mode. When installing injectors, distance between their longitudinal axes is chosen in the range 2.0-4.0 m at with an injection depth of 3.0-8.0 m. In case of compressing argillaceous water-bearing or water-logged loam soil and sandy loam, there is change, at least in one category, of their consistency due to compression and taking out the water in them. The injectors are laid out in series, while infusion of cement mortar into those series is done from the centre to the periphery, preferably in spiral form, successively in each injector or in steps after 1-3 injectors. A possible alternative is laying out the injectors in series, and infusion of the cement mortar is done successively from the centre to the periphery, preferably in radial form, successively in each injector or in steps after every 1-3 injector in radial form or with alternation between adjacent injectors in adjacent radial directions. In the device for implementing the above described technique, the engineering problem is solved based on that, the device for infusion of cement mortar is in the form of a pipe whose lateral surfaces are perforated. The perforations are covered by simultaneously opening caps at a given pressure of the cement mortar. The caps are in the form of overlapping perforation straps, located in spiral form or in form of a ring. The strap can be made of an adhesive layer, inverse to the perforated pipe, and the caps can be made from several layers of straps, the number of which is defined by the given value of pressure of hydraulic fracturing in the soil. In the device for infusion of cement mortar, the perforated tube is equipped with a non-destructible lower end cap at the hydraulic fracturing pressure.

EFFECT: design of a device for soil compression.

11 cl, 2 dwg, 2 ex