SU939646A1 - Apparatus for making soil-concrete piles - Google Patents

Description

The invention relates to a foundation slab, in particular to devices for the manufacture of ground-cement piles, and is intended for the manufacture of soil-cement piles, mainly in soft soils, with bedrock & 1x dense soils.

A device for the manufacture of ground-cement piles is known by mixing the shearer with the soil directly in the soil mass.

without removing it to the surface, made with cutting knives and mixing blades, mounted on a vertical pipe in which there are openings to feed tl3 into the ground.

The disadvantages of this device are the poor distribution of the pile over the cross section of the pile and the impossibility of creating a reliable contact between the pile and the dense underlying soil.

The closest to the proposed technical essence and the achieved effect is a device for the production of ground-cement piles, incorporating a hollow body with a burr and blades with radial channels and outlets

on the ends, and also curvilinear knives.

The device is fixed on the hollow drill pipe of the drilling unit and, after it is inserted into the soil in a spiral with simultaneous feeding into the ground, a cBcUo is formed in the soil from a ground-cement mixture made directly in the pile contour 2.

The disadvantage of this device is the difficulty of reliably sealing the pile of the pile being made into the dense underlying soil.

The purpose of the invention is to increase work efficiency and create a working body for the manufacture of soil-cement piles, providing a reliable nessel pillow in a dense underlying soil with limited

20 in the present moment.

The goal is achieved by those. What is in the device for the manufacture of ground-cement piles, including a hollow body with a grinding chamber, blades with

25 radial channels and outlet openings at the ends, the blades are formed by the inner and outer elements connected to it by a shear pin, the radial channels KOTOIMX coincide

30 is given, and the inner element is rigidly fixed on the body, “the outer one is loosely attached by means of a sleeve attached to it.

In this case, the inner element can be made with tangent channels.

Figure 1 shows the proposed device, a vertical section along the axis of the radial channels; in Fig.2 a section aa in Fig.1.

The device comprises a hollow body 1 with an annular protrusion 2 in the upper part. A zaburnik 3 and an inner element 4 of the blades with radial channels 5 are attached to the housing 1. The outer element 6 of the blades with radial channels 7 and the outlet openings 8 is connected to a sleeve 9 freely seated on the housing 1. The inner element 4 of the blades and the outer element 6 of the blades are separated cylindrical connector 10 when fixing their relative position with a shear oblique pin 11. In the relative position of the internal and external elements of the blades fixed by the pin 11, the radial channels 5 and 7 coincide. On the inner element of the blades there are cutting teeth 12 and additional tangential channels 13

The device works as follows.

The device is fixed on the drill pipe of the drilling unit (not shown) and immersed in the ground by rotating at a small vertical feed per revolution, while pumping it into the ground into the ground, which is fed through the hollow body 1 and the radigshny channels 5 and 7, ending with outlet openings 8. In this case, the fixing of the relative position of the inner and outer elements of the blades, in which the axes of the channels 5 and 7 coincide, is carried out by a pin 11. Release is ejected through holes B located in the end part of the outer element and 6 blades, provides an increased concentration of the pile being made in the peripheral zone of the produced pile. If necessary, repeated lifting and lowering of the device with an additional feed into or without a tug is carried out within that part of the pile body, which is located in weak ground.

When the cutting edges of the outer element 6 enter the dense ground, the resistance to cutting increases sharply, and

consequently, the shearing force in the pin 11, and it is cut off, while opening the outer and inner elements of the blades.

The rotational moment from the drilling aggregate is transmitted only to the inner element 4 of the blades provided with cutting teeth 12, which is easier to penetrate into the dense soil. The outer element 6 of the blades connected by the sleeve 9 stops at the same time, without interfering with the penetration of the internal element 4 of the blades into dense soil by an amount equal to the free course of the sleeve 9 (Fig. 1). The feed into the soil at this stage of manufacturing the pile is made through the outlet of the hydraulic channels 5 and the tangential channels 13, which before cutting the pin 11 are plugged with the surface of the cylindrical connector 10.

The use of the proposed device provides a reliable embedding of the ground cement pile in a dense underlying soil, and consequently, a more complete use of the strength of the pile shaft and reduction in the deformability of the erected structure.

Claims (2)

Invention Formula A device for the manufacture of soil-cement piles, including a hollow body with a drill, blades with radial or channels and outlets and openings at the ends, characterized in that, in order to increase the reliability of embedding the pile of the pile into a dense underlying soil, the blades are formed outside and connected to it with a shear pin internal elements, the radial channels of which coincide, and the inner element is fixed on the housing rigidly and the outer freely through the sleeve attached to it. 2. The device POP.1, characterized in that the internal element is made with tangential channels. Sources of information taken into account in the examination 1. USSR author's certificate number 149717, cl. E 02 D 5/36, 1961. 2. Authors certificate of the USSR 560945, cl. E 02 D 5/36, 1974.