RU2643396C1 - Method of lifting and leveling of buildings/constructions - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method of lifting and levelling buildings/constructions involves the installation of injection pipes and the injection of mobile mortar under the building/construction. Injection cuff pipes under the building/construction are installed horizontally in two stages. At the first stage the sandy soil is conditioned, which makes it possible to redistribute the ground material around the injector in a given radius. Injection of the main injection solution in injectable sleeve pipes, in each of which the injection solution is applied repeatedly to create volumetric bodies of the injection material at strictly defined points of the core, is executed in the second stage.

EFFECT: providing the possibility of redistribution of ground material around the injector in a given radius for its subsequent compaction during the injection of injection solution, increasing efficiency of lifting and levelling of constructions.

1 tbl, 1 dwg

Description

The invention relates to the field of construction and can be used when lifting and leveling buildings / structures by creating a strictly defined (required) volume and distributed in sandy soil with a certain step in a predetermined sequence in a soil mass under a building / structure of volumetric bodies.

There is a method of correcting uneven precipitation of buildings and structures on a slab foundation, in which, before starting the injection of a mobile solution through injection pipes installed around the perimeter of the reinforced part of the foundation, the soil is soaked to weaken, then the mobile solution is injected through the same pipes under pressure, causing hydraulic fracturing of weakened soil, and after the solution has hardened, inject with a mobile solution inside the resulting circuit, and additionally o carry out the draft of the building from the side opposite the roll. After the building is leveled, its position is fixed by feeding the mobile solution into the injection pipes from the side opposite the roll (RF patent No. 2468152, IPC: E02D 35/00, published on November 27, 2012).

The disadvantages of this method are:

- the need to install injection pipes vertically through the base plate, which leads to its weakening and the need to restore it after completion of injection work;

- the need to organize a continuous contour of weakened soil around the active zone of the building;

- injection of the injection composition within one large circuit, which limits the possibility of selective supply of pressure to a specific point depending on the KIA data during injection;

- this method does not allow the rise of the building, but only eliminates the unevenness of precipitation by precipitation, not the banked part of the building.

There is also known a method of straightening the heel of buildings, including creating a screen along the outer contour of the building at a distance of 1.5-2.0 m from its foundation to the depth of the active zone by injection compaction of the soil (RF patent No. 2275473, IPC: E02D 35/00, publ. April 27, 2006). Injection of the active zone of the most compressible part of the base is done with a sealing solution until the base soil is stabilized by means of injectors (injection tubes) located at a distance of 0.5-1.0 m from the foundation or from its external and internal contours with a step of 2-3 m core. The filing of the sealing solution is carried out before the formation of hydraulic fracturing cavities in the soil, and further feeding is performed under a constant pressure of 2-10 atm., Providing around the injectors a compacted soil zone with a radius of 1.5-2.5 m. Then, the least compressible part of the base soil mass is decompressed. buildings to ensure precipitation of part of the building by drilling with coring of deviated wells without casing with a diameter of 73-146 mm, located in the form of fan bushes or at an interval of 0.5-1.5 m, and until the roll is leveled, Tel'nykh inject solution into a decompressed sealing base with a filling them not closed well before the full stabilization of the precipitates.

According to the number of similar features and the achieved result, the specified technical solution is selected as a prototype of the proposed method.

The disadvantages of this method are:

- the need to organize a "screen" around the active zone of the building, limiting the distribution zone of the injection composition;

- limitation of the maximum value of the discharge pressure due to the lack of measures to fill the space between the injection pipe and the ground (lack of cage);

- the proposed injection cement-sand mortar has a very limited ability to penetrate into the ground;

- this method does not allow the rise of the building, but only eliminates the unevenness of precipitation by settling the non-banked part of the building;

- injection of the injection composition within one large circuit, which limits the ability to selectively supply pressure to a specific point, depending on the data of the control and measuring equipment during the injection process.

The technical result to which the invention is directed is to create volumetric bodies in the ground for lifting and leveling buildings / structures.

To achieve the specified technical result in the proposed method of lifting and leveling buildings and structures, including the installation of injection pipes and the injection of a moving solution under the building / structure, the injection cuff pipes under the building / structure are installed horizontally in two stages, the first is used to condition sandy soil, which makes it possible redistribution of soil material around the injector in a given radius, at the second stage, injection of the main injection the solution into injection cuff tubes, into each of which the injection solution is fed repeatedly to create volumetric bodies of injection material at strictly specified points in the core.

The distinguishing features of the proposed method are the installation of injection cuff pipes under the building / structure horizontally in two stages, the implementation of sandstone soil conditioning at the first stage, injection of the main injection solution into injection cuff pipes at the second stage, and multiple injection of injection solution into each injection cuff pipe to create volumetric tel.

This allows for subsequent multiple injection of the main injection solutions that form large-sized solids near each injector, condition (soak) the soil in order to allow redistribution of soil material around the injector in a given radius for subsequent compaction during injection of the injection solution, which should be easily distributed over the surface of the soil grains and ensure their sliding relative to each other.

The proposed method is illustrated in the drawing, which shows a diagram of the rise of buildings / structures by creating volumetric bodies of injection material in a sandy ground mass.

In the drawing, the positions indicated:

1 - injection cuff pipes,

2 - injectors

3 - volumetric bodies,

4 - injection area.

The method is as follows.

Horizontal or deviated wells are drilled under the building / structure, injection cuff pipes 1 are installed in them, through injectors 2, for example injection packers, an impregnation composition is pumped to condition the soil in a given radius, and then the main injection solution of a given volume is injected. The injection solution is cured and forms a material in the form of a volumetric body 3, ensuring its joint work with the soil mass in the injection area 4. The injection solution is not subject to destruction under the influence of ground water.

The volume of the solid created during injection of the injection solution is determined by the height of the lift, the mass of the building / structure and soil characteristics.

Then, the process of water loss (squeezing water) from the main injection solution occurs, the additional effect of which is the colmatization of the intergranular space of soil particles and the creation of a thin dense contour around the volumetric body 3.

Violation of the correspondence of the indicated critical properties of the injection solution, for example, viscosity, water-solid ratio, density, injection parameters, for example pressure, injection rate, hose diameter, etc., leads to soil rupture and, consequently, the inability to control the injection, the process of forming volumetric bodies 3 is precisely near the injector 2, and therefore the impossibility of lifting and leveling the building / structure. Therefore, the effect of water loss from the injection solution provides the formation of a volumetric body 3 in the soil above and below the injector 2. The parameters of the injection solution are determined experimentally, depending on the characteristics of the soil and the discharge parameters.

These parameters were assigned during research and development of lifting technology in laboratory conditions of JSC VNIIG named after B.E. Vedeneeva "for model fine-grained and medium-grained soil.

The formation of a bulk solid is achieved with the following parameters:

The main injection composition in finished form in a supply container, when pumping through injection cuff tubes 1 under pressure, should not be delaminated, have a water separation of not more than 1% of the volume, and the viscosity and connectivity of the solution should ensure the possibility of injection at a speed of at least 4 l / min.

The correct purpose and compliance of the parameters of the injection solution with the injection parameters and soil characteristics guarantees the high efficiency of the proposed lifting method.

Claims (1)

A method of lifting and leveling buildings / structures, including the installation of injection pipes and the injection of a mobile solution under the building / structure, characterized in that the injection cuff pipes under the building / structure are installed horizontally in two stages, the first is conditioning the sandy soil, making it possible to redistribute the soil material around the injector in a given radius, in the second stage injection of the main injection solution into the injection cuff tubes is carried out, in each of which the injection solution is fed repeatedly to create bulk bodies of the injection material at strictly defined points in the core.

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