Down-the-hole hammer drill with integrated grouting nozzle
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Solution Overview
Problem
Existing down-the-hole hammer drills for soil consolidation require deeper drill holes due to the need for a separate monitor unit and separate fluid supply lines, leading to increased complexity and size, as well as unnecessary depth and diameter deviations from the predetermined specifications.
Innovation Solution
Integration of a sideways-facing grouting nozzle and a rinsing channel within the machine housing of the down-the-hole hammer drill, allowing the grouting mixture to be supplied directly to the nozzle through a central channel, eliminating the need for a separate monitor unit and enabling more compact and simpler design while maintaining precise hole dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate monitor unit is used for jet grouting, then the grouting function can be performed, but the drill hole depth and diameter deviate from predetermined specifications
Solution Approach 1:
The patent combines the grouting nozzle and its fluid supply system directly into the machine housing of the down-the-hole hammer drill. The rinsing channel is integrated into the machine housing wall, eliminating the need for a separate monitor unit. This merging of functions allows the drill hole dimensions to match predetermined specifications more accurately while reducing device complexity.
2Device complexity
If separate supply lines are used for driving fluid and grouting mixture, then the grouting function can be performed, but the down-the-hole hammer drill becomes larger and more complicated
Solution Approach 1:
The patent merges the grouting mixture supply channel (rinsing channel) directly into the machine housing structure. The rinsing channel extends along the longitudinal direction within the machine housing wall, integrating the grouting function into the existing drill hammer design without requiring separate external supply lines or a monitor unit, thus maintaining adaptability while reducing complexity.
Solution Approach 2:
The machine housing is designed to serve multiple functions: it houses the impact mechanism for drilling and simultaneously provides the rinsing channel for grouting mixture supply. This multi-functionality eliminates the need for separate dedicated structures for grouting, reducing overall device complexity while maintaining full grouting capability.
3Length of stationary object
If the monitor is located above the down-the-hole hammer drill, then the grouting mixture can be supplied, but deeper drill holes are required
Solution Approach 1:
Instead of placing the grouting monitor above the drill hammer (as in conventional arrangements), the patent inverts the arrangement by integrating the grouting nozzle and rinsing channel directly into the machine housing at the drill bit location. This inversion eliminates the need for extra drilling depth to accommodate a separate monitor unit, allowing drill holes to match predetermined depth specifications accurately.
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 solution allows for drill holes with dimensions closer to predetermined specifications, reducing unnecessary depth and diameter deviations, and results in a more compact and simpler design for the down-the-hole hammer drill, enhancing operational efficiency and design simplicity.
Implementation Method 1
an impact mechanism 3 driven by pressurised fluid, which impact mechanism is arranged to give impacts onto a drill bit 5
Implementation Method 2
a rinsing channel, generally indicated by the reference number 9, for leading the grouting mixture through the machine housing and onwards to the grouting nozzle 7
Implementation Method 3
jet grouting of the soil can begin at a pressure that is normally of a magnitude between one and some tens of megapascals (Mpa), whereby the drill string is withdrawn back up the hole while being rotated
Data Source
Figure 1~3
AI summary
The invention concern an arrangement for a down-the-hole hammer drill (1), particularly for use in soil consolidation through a process known as "jet grouting", and comprising a principally cylindrical machine housing (2), an impact mechanism (3) driven by pressurised fluid that, mounted in the machine housing, is arranged to give impacts onto a drill bit (5) fixed mounted in a chuck (4) in the machine housing in a manner that allows reciprocating motion, whereby the machine housing has a central supply line (6) for the driving fluid to the impact mechanism in which channels in the drill bit constitute outlets for used driving fluid. For improved efficiency during jet-grouting, the machine housing (2) is provided with a grouting nozzle (7) for jet grouting, that the grouting nozzle is directed in a sideways direction and arranged at the periphery of the wall (8) of the machine housing, that a rinsing channel (9) for conducting a grouting mixture through the machine housing to the said grouting nozzle is arranged whereby the rinsing channel for the grouting mixture is separate from the supply line for the driving fluid of the impact mechanism.