Drilling injection system for soil loosening with rotating air streams

Abstract

The soil improvement system is characterized by the use of an air stream to loosen the existing soil with the help of a rotating lance, similar to an earth drill.

Description

Prior soil aeration systems have been designed to break up the existing soil and to eliminate the compactions in the soil structure. For this purpose, lances are introduced into the floor and the floor structure is broken open with a high pressure shock. The pressure wave of the air propagates in the ground in all directions and is supported with the reaction force downward and sideways. As a result, depending on the type of soil, moisture and compaction around the puncture channel, bore hole smearing, pressure compactions and cracks form in the soil structure without the soil as a whole being loosened in its entirety as desired. That is to say, the high air flow / pressure of the systems breaks open the floor because of the nature of the floor, and compacted partial regions are formed in the floor structure depending on the type of floor. These are not loosened by the method to date, but act like individual barriers, past the break-off edges of which the air flows. This results in disruption of the soil physical properties, the exchange of soil gas is disrupted and parts of the root space and also the soil fascia are damaged or disturbed.In contrast to existing systems, this is a mechanically loosening system. The soil is loosened by means of a lance similar to an earth auger.The lance diameter of this system can be varied and is between 50 mm and 250 mm. The lance has at its lower end a cutting edge to break up the compacted soil and at least a complete thread turn with a pitch of mind. 100 mm to draw into the ground. The inclination is intended to allow the lance to screw into heavy and highly compacted soils. Another effect of a high gradient is the low extraction of the soil from the borehole. The tip of the lance is constructed as follows. The tip is equipped with a cutting geometry and centering tip similar to a drill head. In addition, a casing is installed in the region of the first thread turn, at the end of which two nozzles are installed in the region of the boundary geometry. The nozzles are directed upwardly at an angle of at least 15°. Through these nozzles, compressed air can be introduced upwardly into the floor through the lance. The nozzle geometry is designed accordingly to generate a vortex flow. This air stream generates an abrasive effect after it leaves the nozzle and, similar to a drill or milling cutter, loosens the soil in a slightly upward direction vector. In addition, the previously compacted and slurried soil is mixed, so that a loosened grain structure is formed and voids are formed between the soil particles. The air is set in an oscillating pressure movement by a special valve. The uniform oscillating pressure waves do not load and compress the floor structure abruptly; the pressure release takes place in a sinusoidal rhythm. The procedure of a loosening operation is as follows:After the drill bit penetrates into the upper floor, the soil aeration is activated from a depth of 20-30 cm. The rotation movement breaks open and loosens the bottom around the lance. By the arrangement of the nozzle, the drill can work further into the soil and the loosening can be constant to a depth of mind. 1m.The advantage of this system amounts to the wide surface loosening of the soil, the prevention of the smearing of the boundary shell between lance and soil as well as the non-abrupt release of compressed air in the soil and the associated downward compression of the boundary layer.List of reference symbols Drawings1 / Drawing 1 lance with centering tip and cutting geometry, 2 / Drawing 1 outflow opening with vortex nozzle, mind. 15° upward 3 / drawing 1 centering tip

Claims

The soil improvement system is characterized in that, with the aid of a rotating lance similar to an earth auger, an air stream is used to loosen the ground in contact.The soil improvement system according to claim 1, characterized in that the rotating air stream exiting from the lance has an abrasive function and corresponds to a vortex.The soil improvement system according to claim 1, characterized in that the rotating air stream exiting from the lance has an upward direction vector of mind. 15°.The ground improvement system according to claim 1 is characterized in that the air flow in the region of the boundary geometry to the pending ground of the lance leaves the latter.The soil improvement system according to claim 1 is characterized in that the pressure and air flow are applied in pulsating fashion in this method.The soil improvement system according to claim 1, characterized in that the lance has a cutting geometry at the tip, continued with at least one thread in the axial direction.The soil improvement system according to claim 1, characterized in that the lance is rotatably inserted into the soil.The soil improvement system according to claim 1 is characterized in that this method can be applied vertically and horizontally.

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