RU2645015C2 - Method of creating the general broadening for the pile group - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method for creating a common broadening for a piles group in which, in order to increase the bearing capacity of the pile foundation formed by a sweep without increasing the piles number, a bimetallic plate is placed on the lateral side of the flexible pipe, which is submerged in the soil between the piles, bending the heating pipe, which is immersed in the ground in the required direction.

EFFECT: increased bearing capacity of the pile foundation formed by a sweep without increasing the number of piles.

1 dwg, 1 ex

Description

The invention relates to the construction, namely, the construction of pile foundations of buildings and structures arranged by washing on structurally unstable subsidence soils.

A known method of creating a broadening at the end of a group of piles immersed in the soil by washing [1], including:

- immersion at a certain distance from each other of several piles in the soil by washing with the supply of water under pressure through a tube located in the body of the pile or attached to it from the side;

- closing the cavities formed by washing under the end of each pile into a common cavity;

- supply of cement mortar through the water supply tubes up to filling the common cavity with a mixture of mortar and soil;

- removal of all water supply tubes;

- solidification of the mixture to the formation of general broadening.

In this case, the general broadening, which sharply increases the bearing capacity of the foundation, is formed only with a fairly close arrangement of piles.

The disadvantage of this method is the small amount formed by the erosion of the cavity in the soil under the lower end of each pile, as a result of which the formation of general broadening requires a high density of piles. For example, when using micropiles with a cross section of 10 × 10 cm and a length of 2-3.5 m, they will need to be placed in increments of 20-30 cm.

The small dimensions of the cavity under the lower end of each pile are determined by the fact that the water supplied for washing out leaves the pile almost vertically along the boundary between the side surface of the pile to be buried and the soil adjacent to it. At the stage of immersion of the pile into the ground, this destroys the adhesion of the side surface of the pile with the adjacent layers of soil and facilitates immersion.

A known method of increasing the size of the cavity under the general broadening [2], in which a water supply tube without piles is immersed between the piles. Such a tube forms a cavity between piles, which increases the size of the cavity for general broadening without increasing the number of piles. The disadvantage of this method is that, as in the case of a submersible pile, the movement of water does not have a horizontal component.

To overcome this drawback, it is necessary that the end of the water supply pipe, immersed in the ground without piles, upon reaching a certain depth take a horizontal position. When drilling directional wells, downhole motors [3] are used for this, located at the end of the drill string, which actuate the drilling tool with a deflected direction of action [4].

In our case, the use of such devices will complicate the technological scheme for obtaining general broadening, which is incompatible with the method of washing, the distinguishing feature of which is technological simplicity.

The end of the immersed flexible pipe should deviate, but without the use of kinematic mechanical circuits [4].

This contradiction is resolved by the method of “replacing the substance with the field” [5], when the water supply pipe, immersed in the ground without piles, is flexible, and a bimetallic plate is fixed on one side of it.

When such a pipe is immersed in the soil by the washing method, cold water is first supplied through it and the pipe goes down strictly vertically. When a certain depth is reached, a coolant is supplied through it (for example, a mixture of exhaust gases and water), the bimetallic plate heats up and the pipe begins to bend in a certain direction until it moves horizontally and reaches the required point. After that, cold water is supplied to it, the pipe is cooled, gradually straightened and simultaneously removed from the formed horizontal cavity.

The vertical part of the formed well is used repeatedly. A flexible pipe with a bimetallic plate is lowered several times into it. In this case, the azimuth of immersion of the bimetallic plate is constantly changing.

For example, if it is necessary to make four horizontal branch channels (from the number of piles surrounding the well) from one vertical wellbore, then each time the dive azimuth is shifted by 90 degrees. That is, each dive focuses on laying a horizontal channel to a specific pile.

Such channels sharply increase the size of the common cavity under the piles, which, being cemented by an order of magnitude, will increase the bearing capacity of the foundation without increasing the number of piles. In addition, the common cavity obtained by washing out does not have a spherical, but a star-shaped structure, which prevents its arch from collapsing before cementing.

The purpose of the invention: increasing the bearing capacity of the pile foundation, formed by undermining without increasing the number of piles.

This goal is achieved by the fact that on the side of the flexible pipe. immersed in the soil between the piles, there is a bimetallic plate, bending, when heated, a pipe immersed in the soil in the necessary direction.

As a solution, the following method is proposed for creating broadening at the end of a group of piles, submerged in the soil by washing:

- immersion of piles into the ground by washing with the supply of water under pressure through water supply tubes;

- vertical submersion in the soil between the piles of a flexible pipe with a bimetallic plate oriented to one of the surrounding piles, with the supply of cold water through a flexible pipe under pressure;

- feeding into a flexible pipe with a bimetallic plate of hot coolant to change the shape of the pipe and move it in the horizontal direction to a predetermined point and form a horizontal cavity in the soil with a washout;

- the repetition of the last two points to the formation of horizontal cavities directed to each pile from the surrounding surrounding well with a flexible pipe;

- closing the cavities formed by washing under the end of each pile and in the horizontal direction from the central well to each pile, into the common cavity;

- supply of cement mortar through all water supply tubes up to filling the common cavity with a mixture of mortar and soil;

- removal of all water supply tubes;

- solidification of the mixture to the formation of general broadening.

Creating horizontal cavities between piles dramatically increases the overall broadening and allows you to do with fewer piles during its formation of time and increases productivity.

The proposed method allows you to adjust the shape of the general broadening. With the help of a washout, a general star-shaped broadening can be formed under the pile foundation, where the number of rays in each column will depend on the number of piles surrounding a flexible pipe with a bimetallic plate.

The inventive method with its inherent essential features can be repeatedly and in various ways using various devices and materials successfully implemented in practice to obtain the above result.

Example. The method of forming general broadening is illustrated by the drawing in FIG. one.

A group of piles (1) is immersed in soil (2) by washing. In this case, water is supplied through steel pipes (3), fixed on the side surface of the pile. In the center of the group, a flexible steel pipe (4) is immersed in the soil by ablution, in the lower part of which a bimetallic plate (5) of steel and aluminum is welded. When a hot mixture of water and exhaust gases is fed through a flexible pipe, the end of the pipe bends, creating a horizontal cavity (6), which closes with the cavity under the pile (7). Other horizontal cavities (8) are created in a similar way, connecting the cavities under the piles into a general broadening into which cement mortar is pumped through water supply tubes.

Information sources

[1] Electronic resource: http://svaika.ru/pogruzhenie-svay-s-primeneniem-podmiva-vodoy-i-elektroosmosa

[2] Chudakov Ya.S., Kupchikova N.V. Installation for the simultaneous immersion of four micro piles and the device of terminal broadening. Astrakhan: AISI Publishing House. Collection “Innovative technologies in management, education and industry. ASTINTECH ”, 2012 - S. 238.

[3] Electronic resource: http://vseoburenii.ru/process/naklonnoe-burenie-skvazhin.html

[4] RF patent №2151258, IPC Е21В 7/08.

[5] Copyright certificate SU 1539136, B63C 7/24, 1988.

Claims (1)

A method of creating a general broadening for a group of piles, characterized in that in order to increase the bearing capacity of the pile foundation formed by the washout without increasing the number of piles, a bimetallic plate is located on the side of the flexible pipe dipped by the washout in the soil between the piles, bending, when heated, immersed into the ground pipe in the required direction.

Images