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No Vibration Stone Column Drill

a technology of vibration stone and drill bit, which is applied in the direction of drilling rods, drilling pipes, foundation engineering, etc., can solve the problems of increased torque requirements, difficult hard ground, and significant maintenan

Pending Publication Date: 2022-05-05
MCMILLAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a device used to connect two parts of a drill shaft. It includes two slots and a biasing device. The biasing device keeps the sub-sections separate but can allow them to come closer if a force is applied to one of them. The slots help to reduce this separation, but only when the force on the second sub-section is greater than the biasing force. This device helps to keep the drill shaft secure and aligned during use.

Problems solved by technology

Unfortunately this terminally located uniformly expanded section (7) can, unless the operator is skilled, result in increased torque requirements and be problematic in hard ground.
The wear and damage caused when engaging this four pair of rollers (9) configuration can require significant maintenance, and the skill required by an operator to minimise this damage is high.
Granular columns formed in-situ can suffer from contamination as the drill is rotated and withdrawn, this can compromise the properties of the column formed.
Unfortunately with the variation in properties between hard and soft ground specific teeth are required to optimise the power requirements and drill efficiency.
The requirement for specific teeth for each ground type increases the cost as a full set of each configuration is required on site.

Method used

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  • No Vibration Stone Column Drill
  • No Vibration Stone Column Drill
  • No Vibration Stone Column Drill

Examples

Experimental program
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Effect test

Embodiment Construction

[0275]Referring to FIG. 39 a variant including the preferred general features from the various earlier variants is shown in partial cross-section. This variant is believed to be the best general combination of features, it does not include the features of the hollow feeder (40) variant (see FIG. 31) or tension device (200) (see FIG. 33) as these are less general.

[0276]This variant includes a drill flight (24) and the additional flight (25) both with an asymmetric drill tooth (130) as this allows onsite customisation for the ground conditions. This feature is described in more detail under the heading Asymmetric Drill Tooth.

[0277]The drill flight (24) includes an angle transition point (30) or transition zone (38) as this is believed to provide a higher quality granular column (34) (see FIG. 18 for example). This feature is described in more detail under the First Variant, Second Variant, Third Variant and Sixth Variant headings.

[0278]The drill body (23) includes one or more compacto...

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PUM

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Abstract

A drill including a drill flight where the drill flight changes angle from a primary flight angle (A1) to a secondary flight angle (A2).

Description

TECHNICAL FIELD[0001]The present invention is a drill for forming an in ground granular column or an improvement to such a device.BACKGROUND ART[0002]In ground granular columns of aggregate are used to provide a foundation, improve drainage or stabilise the ground. Some of these columns incorporate a binder such as concrete to improve their stability.[0003]There are a variety of devices used to create these granular columns, one which improves the radial compaction of the wall and vertical compaction of the column is shown in FIG. 1. In this variant the drill (1) is a dual concentric drill design with a first drill (2) and a second drill (3). The second drill (3) is inside the first drill (2) during the drilling phase. Once the drill (1) is at full depth the second drill (3) is engaged and extended beyond the terminal end (4) of the first drill (2). The second drill (3) then feeds the granular material from the hopper (5) through a central void in the first drill (2) to the base of ...

Claims

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Application Information

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IPC IPC(8): E02D3/12E02D3/08E02D5/46E02D27/12E21B17/22
CPCE02D3/126E02D3/08E02D5/46E02D27/12E21B10/44E02D2250/0038E02D2300/0018E02D2300/0079E21B17/22E02D5/56E02D5/62E02D3/02E02D7/22
Inventor MCMILLAN
Owner MCMILLAN