RU2717554C1 - Bored pile device method - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to construction, in particular, to pile foundations. Bored pile installation method includes well formation in soil by drilling, arrangement of metal frame in pipe cavity and supply of concrete mixture to it. By screwing in the drilled well, the pipe with screw winding is lowered at the lower end of the pipe, at that, the winding has larger diameter relative to the well diameter for formation of contact of the screw worm edge with the well walls. After the frame is placed in the cavity of this pipe, the concrete mixture is supplied through it to the well under pressure and the pipe is unscrewed at the same time; the walls of the well are compacted and the pile is formed with a concrete mixture under the screw worm as the pipe moves.

EFFECT: technical result consists in expansion of arsenal of technical means used in construction of bored piles, providing higher bearing capacity of bored pile due to compaction of walls of well at formation of pile, simplification of technology of erection, reduction of power inputs.

1 cl, 5 dwg

Description

The invention relates to the construction, in particular to pile foundations.

A known method of constructing a bored screw pile in the soil, including the formation of a well in the soil by drilling and issuing the destroyed soil to the surface by means of a hollow screw drill with a rock cutting tool, extracting the drill from the well and filling the well with concrete as the drill goes up, places a metal in the well frame after the complete exit of the drill from the well and filling it with concrete mixture (RF Patent No. 2317373 C1, priority date 01/30/2007, publication date 20.02. 2008, authors: Bey Yu.N. et al., RU).

The disadvantage of the analogue is the high complexity of the implementation of the method, due to the need to immerse the frame in a well filled with concrete mixture, and to its entire depth to ensure load-bearing capacity.

A known method of erecting a bored pile in the soil, adopted as a prototype, including the formation of a well in the soil by drilling and issuing the destroyed soil to the surface by means of a casing with screw winding on the outer surface and with a rock cutting conical tip, placing a metal frame in the pipe cavity and filling it concrete mixture, and then until the concrete has hardened, the pipe is unscrewed from the ground or left in the ground (RF Patent No. 2208088 C2, priority date 08/28/2001, publication date 10/07/2003, authors: asiev AN et al., RU, prototype).

The disadvantages of the prototype: screwing into the soil under pressure of the casing with screw winding from round reinforcement along the entire length of the pipe (screw spiral) and with a conical baking powder requires the use of heavy drilling rigs with high power with significant torque, which is not always possible near existing foundations for their large dimensions, and the fact that the casing pipe filled with concrete mix remains in the soil as part of the pile leads to a rise in the cost of construction of the foundation, in addition, the erected bouron Bivni pile has a low load-bearing capacity because of unconsolidated wellbore.

The technical problem solved by the invention is the need to expand the arsenal of technical means to increase the bearing capacity of a bored pile by compaction of the walls of the borehole and simplify the method while reducing energy costs.

To solve a technical problem and achieve a technical result, a method for a bored pile device is proposed, which includes forming a well in the ground by drilling, placing a metal frame in the cavity of the pipe and supplying concrete mixture to it. What is new is that a screw-coiled pipe is lowered into the drilled hole by screwing at the lower end of the pipe, the coiling having a larger diameter relative to the diameter of the borehole to form a contact between the edge of the screw-wound coiling and the borehole walls. After placing the frame in the cavity of this pipe through it, the concrete mixture is supplied into the well under pressure and the pipe is unscrewed at the same time, the walls of the well are compacted and a pile is formed with concrete mixture under the screw winding as the pipe moves.

The essence of the method of device bored piles is illustrated in a graphic diagram, where:

- in FIG. 1 shows a drilled well 1;

- in FIG. 2 - pipe 2 screwed into a drilled well with screw winding at the end of the pipe;

- in FIG. 3 - installation of a metal frame 3 in the cavity of the pipe 2;

- in FIG. 4 - supply of concrete mixture 4 through the cavity of the pipe 2 into the well 1 under the screw strip while unscrewing the pipe 2;

- in FIG. 5 - finished bored pile 5, formed in a well with compacted soil walls.

According to the above diagram, the method of device bored piles is as follows.

A pipe 2 is screwed into a drilled well 1 with a screw winding at the lower end of the pipe, and the winding is made with a larger diameter relative to the diameter of the well 1 to form a contact of the screw screw edge with the walls of the well, and the upper end of the pipe 2 is equipped with a communication element with the rig rotator ( in Fig. 2, 3, 4 conditionally not shown). A metal frame 3 is lowered into the cavity of the pipe 2. After placing the frame 3 in the cavity of the pipe, concrete is supplied under pressure to the well under the screw strip through it and the pipe is unscrewed at the same time. The presence of a screw strip in contact with the walls of the well does not allow the concrete mixture 4, supplied under pressure, to rise up the well 1, contributing to the compaction of the walls of the well during the formation of piles 5 from the pressure exerted by the injected mixture 4. As a result, a finished bored pile 5 is obtained. formed in a well with compacted soil walls and having increased bearing capacity.

Thus, the technical result achieved during the implementation of the invention is to expand the arsenal of technical means used in the construction of bored piles, providing increased load-bearing capacity of the bored pile due to compaction of the borehole walls during pile formation and simplification of the construction technology.

Claims (1)

A method of installing a bored pile, including forming a well in the ground by drilling, placing a metal frame in the cavity of the pipe and supplying concrete mixture into it, characterized in that a pipe with a screw winding is lowered into the drilled hole at the lower end of the pipe, the winding having a larger diameter in relation to the diameter of the well to form a contact of the edge of the screw winding with the walls of the well, and after placing the frame in the cavity of this pipe, concrete is fed into the well through it under pressure and at the same time unscrew the pipe, while compacting the walls of the well and form a pile with concrete mixture under the screw winding as the pipe moves.

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