RU2672698C1 - Device for manufacturing of bored tapered pile - Google Patents

Abstract

FIELD: construction.SUBSTANCE: invention relates to the field of construction and can be used to strengthen shallow foundations of buildings and structures under construction as well as existing buildings and structures during their reconstruction and repair. In the method, the device for the manufacture of a bored tapered pile consists of successively connected rods with a central injection channel, joined by couplings, and a drilling device at the end of the lower rod. Said drilling device is made in the form of a drilling head, consisting of drop-down blades hinged at the end of the lower rod and having a helical profile, as well as openings for feeding the working solution.EFFECT: technical result consists in increasing the bearing capacity due to the manufacture of a bored tapered pile.1 cl, 9 dwg

Description

The invention relates to the field of construction and can be used to strengthen the foundations of shallow laying both of buildings and structures under construction, and existing during their reconstruction and repair.

Known bored pile, including expanding upward trunk (see patent SU 1043258, IPC E02D 5/50 - analogue).

A known construction of a driven pile with expandable blades (see patent RU 2063496, IPC E02D 5/54 - analogue).

A known construction of an injection anchor, consisting of rods with a central injection channel, joined by couplings, and a drill bit (see patent DE 3400182 A1, IPC E02D 5/80 - prototype).

A common disadvantage of the known structures is the lower bearing capacity.

The technical result is an increase in the bearing capacity in the manufacture of boreinjection conical piles.

The technical result is achieved by the fact that in the device for the manufacture of injection conical piles, consisting of series-connected rods with a central injection channel, connected by couplings, and a drilling device at the end of the lower rod, according to the invention, the drilling device is made in the form of a drill head, consisting of expanding blades pivotally attached to the end of the lower rod and having a screw profile, as well as openings for supplying a working solution.

The novelty of the invention lies in the fact that the design of the drill head of the injection pile is changed. The drill head consists of three blades that open when lifting, through the holes of which a working solution passes, eroding the soil and filling the conical broadening. Using this design makes it possible to obtain a conical-shaped bored pile with a higher bearing capacity compared to a cylindrical one.

According to the patent and scientific and technical literature, no such solution was found, which indicates the inventive step of the application.

The invention is illustrated by drawings, where in FIG. 1 shows the drilling of a well through the existing building foundation and the achievement of the design mark of the injection pile; in FIG. 2 - formation of a boron-injection conical pile when changing the initial direction of the translational-rotational movement of the drill head; in FIG. 3 - removal of the drill head from the well; in FIG. 4 shows the design of the drill head of an injection conical pile; in FIG. 5 is a top view of the drill head; in FIG. 6 - section aa; in FIG. 7 - section BB; in FIG. 8 - position of the blades of the drill head when it is raised (top view); in FIG. 9 - the position of the blades of the drill head when it is raised (side view).

A device for the manufacture of a conical injection pile while reinforcing a shallow foundation 1 in a well 2 comprises a rod of several rods 3 interconnected by couplings 4. On the lower rod 5 there is a removable drill head 6. It consists of three expandable drill blades 7, inside of which openings 9 are arranged for the passage of the working solution 8. The outer surface of the blades 7 is a screw profile. The blades 7 are pivotally mounted on the lower rod 5 of the pile. In the lower part of the lower rod 5 there are blades 10, inside which holes 11 are arranged for the passage of the working solution 8. The working solution 8 is supplied to the drill head 6 through the central injection channel 12 in the rods 3 and 5.

The device of the injection conical pile is performed in the following sequence:

The drill head 6 is screwed onto the rod 5 and immersed into the ground by means of a drilling technique. In the process of immersion, the pile is increased using rods 3, connecting them with couplings 4. When the design mark is reached, the direction of rotation changes and the structure of the pile is raised while the working solution 8 is supplied under pressure 0.6-0.8 MPa through the central injection channel 12 and holes 9 in the drilling blades 7. The supply of a solution under pressure helps to compact the soil in the near-pile space, as well as expand the diameter of the pile. As the pile structure rises, the pressure of the working solution gradually (0.2-0.3 MPa / m) increases to 1.2-1.6 MPa. In this case, the drilling blades 7 are opened under the action of friction against the soil and the working solution 8 exiting under pressure from the holes 9 of the drill blades 7 and the holes 11 of the blades 10 of the drill head 6, forming a conical injection pile. The above values of the mortar supply pressure are taken depending on the soil conditions of the construction site. With a higher solution supply pressure, destruction of the existing foundation is possible.

Claims (1)

A device for the manufacture of a borejection conical pile, consisting of series-connected rods with a central injection channel, joined by connecting couplings, and a drilling device at the end of the lower rod, characterized in that the drilling device is made in the form of a drill head consisting of expandable blades hinged at the end lower rod and having a screw profile, as well as holes for the supply of working solution.

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