JP2004324274A - Fluid jetting device of auger drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform diameter increased digging and easily form foot protection concrete by projecting the tip of the high-pressure fluid jetting nozzle of an auger drill digging the ground under a concrete pile through the pile to the outside from the outer diameter of the blade of the auger drill. <P>SOLUTION: The high-pressure fluid jetting nozzle 20 fitted to the side face of the auger drill near the lower end thereof is formed in a double tube having a fixed outer tube 21 and a movable inner tube 30 moving forward and backward within a specified distance in the fixed outer tube 21. The movable inner tube 30 comprises a jetting hole 32 at the tip and a sealed sleeve 34 for inserting, therein, the tip of a high-pressure fluid supply tube 14 fitted to the rear end. The device also comprises a spring 23 energizing the inner tube 30 in the backward direction. When high-pressure fluid is jetted, the high-pressure fluid moves forward the inner tube 30 against the energizing force of the spring 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluid ejection device for an auger drill. More specifically, when submerging concrete piles and the like in the ground, insert an auger drill into the pile to use for expanding the ground below the pile and forming a large diameter concrete bulb, The present invention relates to a structure of a high-pressure fluid ejection device.
[0002]
[Prior art]
When laying a foundation pile such as a concrete pile in the ground, it is necessary to insert an auger drill through the hollow part of the pile and to lay the pile while drilling the ground below the lower end of the pile with this auger drill. Have been In this case, an enlarged diameter part is formed in the support layer near the lower end of the pile and below it, and a concrete with a diameter larger than the outside diameter of the pile is formed in the support layer, and this is integrated with the pile, There is a technology that greatly increases the bearing capacity of a vehicle.
[0003]
When forming this compacted concrete, an auger drill is protruded below the lower end of the pile to excavate and knead the ground below the lower end of the pile. A high-pressure fluid ejection device for ejecting cement milk or the like is attached near the lower end of the auger drill.
[0004]
The nozzle of such a high-pressure fluid ejection device is provided on the lower end member of the auger drill so as to project at right angles to the auger axis so as to eject the high-pressure fluid radially outward.
[0005]
However, conventionally, such a high-pressure fluid injection nozzle has not been able to project the tip of the nozzle radially outward from the outer diameter of the screw blade of the auger drill.
[0006]
[Problems to be solved by the invention]
As described above, the high pressure fluid injection nozzle of the conventional auger drill cannot make the tip of the nozzle protrude outside the outer diameter of the blade of the auger drill. In order to form compacted concrete, if the tip of the nozzle of the high-pressure fluid injection device can protrude radially outward from the outer diameter of the blade of the auger drill, the nozzle can be made to work closer to the expanded diameter, which is an advantage. Is big.
[0007]
The present invention has been developed based on this point of view.When not injecting high-pressure fluid, the tip does not protrude outside the outer diameter of the auger drill blade, and when injecting high-pressure fluid, It is another object of the present invention to provide an auger drill fluid ejecting apparatus having a tip projecting radially outward from an outer diameter of the auger drill.
[0008]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems, and its technical means is to provide a high-pressure fluid injection nozzle attached to a side surface near the lower end of an auger drill with a fixed outer cylinder and a fixed inner cylinder. A movable inner cylinder that moves forward and backward by a distance, and the movable inner cylinder includes a sealed sleeve that has an ejection hole at the tip and inserts the tip of the high-pressure fluid supply pipe at the rear end, and retracts the inner cylinder. A fluid ejecting apparatus for an auger drill, comprising: a spring for urging the inner cylinder against a biasing force of the spring when a high-pressure fluid is ejected.
[0009]
The nozzle of the present invention is configured such that the movable inner cylinder is moved forward by the pressure of the high-pressure fluid, and the tip of the nozzle is freely extended.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a fluid ejection device for an auger drill according to the present invention will be described below with reference to the drawings.
[0011]
FIG. 1 is a longitudinal sectional view of a lowermost member 10 of an auger drill according to an embodiment of the present invention. The lowermost member 10 mainly describes a fluid ejecting apparatus by omitting descriptions of a cutting blade, a screw blade, and the like.
[0012]
The lowermost member 10 of the auger drill is provided with a connecting member 11 and a supply pipe 14 for supplying a high-pressure fluid from the fluid passage base 13 to the injection nozzle 20.
[0013]
A nozzle 20 of the fluid ejection device is provided on a side surface of the lowermost member 10 of the auger drill.
[0014]
The nozzle 20 includes a fixed outer cylinder 21 and a movable inner cylinder 30 coaxially inserted into the fixed outer cylinder 21. The fixed outer cylinder 21 is provided with a base 22 at the tip, and the movable inner cylinder 30 is provided with a flange 31 on the outer periphery of the tail end. A coil spring 23 is interposed between the base 22 and the flange 31. In the movable inner cylinder 30, the flange 31 slides on the inner peripheral surface of the fixed outer cylinder 21 in the forward / rearward direction, and the outer diameter of the movable inner cylinder 30 slides in the front end base 22 of the fixed outer cylinder 21 in the forward / backward direction. . The movable inner cylinder 30 has a piece 33 provided with a high-pressure fluid ejection hole 32 at the tip, and forms a sleeve 34 at the tail end side. The high-pressure fluid supply pipe 14 is inserted into the sleeve 34 circle.
[0015]
The space between the inner diameter of the sleeve 34 and the high-pressure fluid supply pipe 14 is sealed by a seal material 36. A ball valve 35 is provided in the movable inner cylinder 30, and the nozzle 20 is closed when not in use.
[0016]
FIG. 2 shows a state where the movable inner cylinder 30 is advanced by supplying a high-pressure fluid. The high-pressure fluid is supplied from the high-pressure fluid supply pipe 14 into the movable inner cylinder 30 sleeve 34, and advances the movable inner cylinder 30 against the urging force of the spring 23. At this time, the ball valve 35 is opened, and the high-pressure fluid is ejected from the high-pressure fluid ejection hole 32. The pressure of the high-pressure fluid, the direct line of the sleeve, the spring constant and the set length of the spring 23, the opening and closing pressure of the ball valve 35, and the like are appropriately determined and set by design.
[0017]
For example, an auger drill used for a prestressed concrete pile having an outer diameter of 600 mmφ can project about 90 mm.
[0018]
【The invention's effect】
Since the fluid ejection device of the auger drill of the present invention is configured as described above, it is possible to easily form a support bulb having an expanded diameter on the support ground at the lower end of the concrete pile, which contributes to the reinforcement of the pile. However, it has an excellent effect of being extremely large.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment; FIG. 2 is a partial view of FIG. 1 and is a longitudinal sectional view showing a state when a diameter is enlarged;
[Explanation of symbols]
Reference Signs List 10 Lowermost member 11 Connecting member 13 Fluid passage base 14 Supply pipe 20 Injection nozzle 21 Fixed outer cylinder 22 Cap 23 Coil spring 30 Movable inner cylinder 31 Flange 32 High-pressure fluid ejection hole 33 Piece 34 Sleeve 36 Seal material 35 Ball valve

Claims (1)

The high-pressure fluid injection nozzle attached to the side near the lower end of the auger drill is a double cylinder consisting of a fixed outer cylinder and a movable inner cylinder that moves forward and backward within a fixed distance within the fixed inner cylinder. A rear end is provided with a sealed sleeve for inserting a tip of a high-pressure fluid supply pipe at a rear end, and a spring for urging the inner cylinder in a retreating direction. A fluid ejection device for an auger drill, characterized in that the inner cylinder is moved forward against the pressure.

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