Earth Pipe Coupling via Flow-Through Assembly and Segmented Drilling
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Solution Overview
Problem
Current methods for coupling earth pipes into the ground during well drilling are inefficient and costly due to the need for large initial holes, excessive use of tightening materials, and unreliable anchoring of the casing part, as existing technologies lack effective routes for guiding the tightening mass outside the casing part.
Innovation Solution
The method involves a drilling apparatus with a casing part and drilling unit that includes first and second drilling means for drilling and reaming, and a flow-through assembly at the casing shoe to lead the tightening mass from inside the casing part to the space between the casing and the hole, ensuring reliable external coupling and minimizing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a significantly bigger hole is drilled than the earth pipe requires, then the earth pipe can be installed and tightened into the ground, but the drilling time and cost increase significantly
Solution Approach 1:
The drilling process is segmented into two distinct phases: first drilling a pilot hole with the first drilling means, then reaming the hole with the second drilling means to the final diameter. This allows the earth pipe to be installed in a hole of the exact required diameter without needing to drill a significantly larger hole first, thereby reducing drilling time while ensuring proper fit and tightening reliability
Solution Approach 2:
The pilot hole is drilled in advance before reaming to the final diameter. This preliminary action allows the drilling apparatus to be positioned and the hole to be prepared, then the reaming operation creates the exact diameter needed for the earth pipe, eliminating the need to drill a much larger hole and reducing overall drilling time
2Reliability
If a significantly bigger hole is drilled than the earth pipe requires, then the earth pipe can be installed, but the amount of tightening mass required increases disproportionately
Solution Approach 1:
The drilling process is segmented into pilot hole drilling and reaming to final diameter. This ensures the hole diameter matches the earth pipe dimensions closely, minimizing the annular space that requires tightening mass. The tightening mass is only needed in the small gap between the pipe and the precisely-sized hole, rather than filling a large void from drilling an oversized hole
Solution Approach 2:
The hole diameter parameter is precisely controlled through the two-stage drilling process to match the earth pipe outer diameter. By changing the drilling approach from single-stage oversized drilling to two-stage precision drilling, the hole diameter parameter is optimized to minimize the volume of tightening mass required while maintaining adequate contact for reliable tightening
3Ease of operation
If the protecting pipe is pulled out from the drilled hole in a separate work stage, then the earth pipe can be installed, but the overall process becomes slower and more expensive
Solution Approach 1:
The functions of drilling, reaming, and earth pipe installation are merged into a single continuous operation. The drilling apparatus with its two-stage drilling means drills the hole and the earth pipe is installed immediately afterward without removing any protecting pipe. This eliminates the separate work stage of pulling out a protecting pipe, maintaining ease of operation while significantly improving productivity
Solution Approach 2:
The drilling apparatus is designed with multi-functionality, performing both pilot hole drilling and reaming operations, and facilitating direct earth pipe installation. This universal apparatus eliminates the need for separate protecting pipes and multiple work stages, combining multiple functions into one integrated system that maintains operational simplicity while boosting productivity
4Device complexity
If no flow-through channels are provided outside the casing part, then the drilling apparatus is simpler, but the tightening mass cannot enter or drift fast enough outside the casing part for reliable external tightening
Solution Approach 1:
Flow-through channels are provided locally at the lower end of the casing part, specifically where needed for tightening mass injection. This localized addition provides the necessary function for reliable external tightening without making the entire drilling apparatus complex. The channels are positioned exactly where the tightening mass needs to be delivered to achieve proper external coupling
Solution Approach 2:
The flow-through channels act as intermediaries that guide the tightening mass from inside the casing part to the space outside. These channels mediate the transfer of tightening material, ensuring it reaches the external space quickly and effectively for reliable tightening, while adding minimal complexity to the overall apparatus structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies and enhances the drilling process by allowing efficient groundwater protection, reducing the amount of tightening material needed, and eliminating the need for an extra work stage, resulting in improved work efficiency and cost savings.
Implementation Method 1
a flow-through assembly X is arranged in the drilling device 1 essentially at a lower end of the casing part 2 and/or in front thereof, when viewed in the drilling direction s, in order to lead the solidifying mass M to be brought internally in the casing part 2 by means of a flow-through assembly X essentially at a lower end of the casing part 2 and/or in front thereof, when viewed in the drilling direction s, into a space between an outer surface of the casing part 2 and the basic hole
Data Source
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AI summary
The invention relates to a method for coupling an earth pipe into the ground when exploiting an apparatus that has a drilling device (1 ), consisting of a casing part (2) and a drilling unit (3) inside thereof, which drilling unit includes: first drilling means (4) at a drilling head thereof for drilling a centre hole and second drilling means (5) for reaming the centre hole for the casing part (2), which casing part (2) is arranged to be drawn into the hole by the first and/or second drilling means; and a flushing flow arrangement (6). After the drilling of a basic hole for the earth pipe and after the first drilling means (4) have been lifted up, solidifying mass (M) is being lead to the bottom or the basic hole in order to couple the earth pipe to the surrounding ground, The solidifying mass (M) is brought internally in the casing part (2), by means of a flow-through assembly (X) essentially at a lower end of the casing part at a lower end of the casing part (2) into a space between an outer surface of the casing part (2) and the basic hole. The invention also relates to an apparatus operating according to the method.