JP3612570B2 - Perforated rod - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drilling rod with spiral blades used for drilling in the ground or the like.
[0002]
[Prior art]
When embedding concrete piles in the ground or injecting cement milk into soft ground to improve the ground, a hole with a predetermined depth is often drilled in the ground. As a drilling device used for this drilling, a drilling tool having a spiral blade is attached to the tip of a rod (also called a “screw”) having a spiral blade on the outer periphery, and the drilling tool is forcedly rotated by pressing the drilling tool against the ground. Devices for drilling are widely used. During drilling, the excavated earth and sand are pushed up through the drilling tool and the spiral blade of the rod, and discharged out of the drilled hole.
[0003]
The spiral blade of the rod is formed by twisting an elongated plate and welded to the cylindrical shaft portion of the rod, but this blade has a horizontal tangent on the upper surface that is substantially horizontal (perpendicular to the axial direction). For this reason, it was difficult for the earth and sand placed on it to fall off, and the operator had to remove the earth and sand pushed up out of the hole from the spiral blade with a scoop or the like. In particular, in the case of clay-like ground, the dusting (the earth and sand that has been dug up) is firmly attached to the perforated rod, and therefore it is very difficult to remove this outside the hole.
[0004]
[Problems to be solved by the invention]
Then, this invention makes it the subject to be able to remove the earth and sand pushed up along a spiral blade comparatively easily.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following configuration. That is, the piercing rod according to the present invention is a piercing rod provided with a spiral blade on the outer peripheral portion and attached to the tip portion to pierce the ground or the like. The upper surface is formed as an inclined surface such that the outer side gradually becomes lower in the upright state of the rod, and there is a baffle member for scraping the earth and sand that hinders upward movement of the earth and sand between the upper and lower spiral blades. It is characterized by being provided .
[0006]
This perforated rod is inclined so that the upper surface of the spiral blade on the outer peripheral portion becomes gradually lower on the outer side, so that the earth and sand put on it is easily spilled to the side when it reaches the outside of the hole. . For this reason, it is easy to remove earth and sand. Even in the case of clay-like earth and sand, since the upper surface of the blade on which it is placed is inclined outward, it is difficult to be pressed into the space between the blade and the blade, and it can be removed relatively easily. it can. Furthermore, the movement of the earth and sand rising along the spiral blade during drilling is obstructed by a baffle member provided between the upper and lower spiral blades and does not adhere to the cylinder shaft of the drill rod. Is even easier.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. First, FIG. 1 and FIG. 2 show a specific example of the perforated rod of the present invention, and this perforated rod 1 is provided with a spiral blade 3 along the axial direction on the outer peripheral portion of a cylindrical shaft 2. The spiral blade 3 is formed in a shape in which an elongated steel plate is spirally twisted, and is fixed to the cylinder shaft 2 by welding.
[0008]
The spiral blade 3 is formed as an inclined surface 3a so that a portion protruding to the side gradually becomes lower. The inclination angle A is several degrees to several tens of degrees, and the angle may be optimized according to the use conditions. However, in the case of ordinary earth and sand, it is preferably set to, for example, 15 to 30 degrees. If the angle of inclination is too small, the desired effect is difficult to obtain, and if it is too large, it will be difficult for the earth and sand to be sent out from the bottom of the hole.
[0009]
3 and 4 show a conventional perforated rod of the same type, and this perforated rod 50 also has a spiral blade 53 fixed to a cylindrical shaft 52. However, as shown in FIG. 4, this conventional perforated rod spiral blade has a lateral tangent L on its upper surface perpendicular to the vertical axis, that is, horizontal. For this reason, the earth and sand placed on the horizontal spiral blade is difficult to spill out. Further, in the case of clay-like earth and sand, it tends to be pressed into the space D between the upper and lower blades, but in the case of the spiral blade of the present invention, the tangent L ′ on the upper surface is inclined outward. Therefore, it is easy for spillage.
[0010]
Further, the perforating rod 1 is provided with baffle members 5 at appropriate intervals. In the illustrated example, the baffle member 5 is formed in a triangular prism shape, and is fixed to the side surface portion of the cylindrical shaft of the interval portion D of the spiral blade along the axial direction. The baffle member 5 is for scraping the earth and sand sent by the spiral blade 3 from the cylindrical shaft 2 .
[0011]
As shown in FIGS. 6 to 8, a punching tool 10 having a spiral blade is fixed to the tip of the punching rod. In the illustrated example, piercing the rod is represented as a conventional (the same is true in those of the present invention), the base of the puncture Anagu 10 is formed in a prismatic shape, provided at the tip portion of the piercing rod 1 binding It fits in the square hole of the part and is fixed with pins p and p. In this punching tool 10, a spiral blade 12 is fixed to the outer peripheral portion of a cylindrical base shaft 11, and a plurality of bits 15,... Are attached at appropriate positions near the tip of the spiral blade 12 to form a spiral blade. Yes. Further, a valve 18 made of a rubber plate 17, a part of which is fixed by a presser fitting 16, is provided at the distal end opening of the base shaft 11 of the punch 10. This valve 18 is for injecting cement milk after drilling, and is opened only outward.
[0012]
When using this drilling rod 1, the upper end is connected to a rotating device (not shown), and drilling is performed while forcibly rotating in a predetermined direction with the drilling tool 10 at the tip pressed against the drilling site such as the ground. . By this rotation, the ground is excavated by the bits 15 of the drilling tool 10, and the drilling tool 10 gradually descends together with the drilling rod 1. The dust (sediment) generated by the excavation is gradually sent upward by the spiral blade 12 of the drilling tool 10 and the spiral blade 3 of the drilling rod 1 and discharged out of the hole. At this time, when the baffle member 5 is provided, the movement of the earth and sand is disturbed by the baffle member, and the material adhering to the cylindrical shaft 2 is scraped off. Since the earth and sand that has reached the outside of the hole is free to move laterally as regulated by the hole wall, it spills laterally along the inclined surface 3a of the spiral blade. Thereby, earth and sand can be easily removed from the perforated rod. Even in the hole being drilled, the earth and sand spills into the inner wall of the hole along the inclined surface of the spiral blade 3 and is pressed against the inner wall of the hole, so that the density of the hole wall is improved and the hole wall is not easily broken. Moreover, since the amount of earth and sand discharged from the hole is reduced by the amount spilled in the hole, the soil discharging process is facilitated.
[0013]
In the above description, vertical downward drilling has been described, but it goes without saying that tilt drilling and horizontal drilling are also effective. It is obvious that a rod having such a spiral blade can be used for transferring other fluids.
[0014]
【The invention's effect】
As described above, in the perforated rod according to the present invention, the spiral blade is inclined outward, and the baffle member is provided between the upper and lower spiral blades. Is easy to remove.
[Brief description of the drawings]
FIG. 1 is a side view showing a specific example of a perforated rod of the present invention.
FIG. 2 is a longitudinal sectional view thereof.
FIG. 3 is a side view of a conventional perforated rod.
FIG. 4 is a longitudinal sectional view thereof.
FIG. 5 is a cross-sectional view taken along the line XX in FIG.
FIG. 6 is an explanatory view showing a state in which a punch is attached.
FIG. 7 is a cross-sectional view of the main part.
FIG. 8 is a bottom view of the valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drilling rod 2 Tube axis 3 Spiral blade 5 Baffle member 10 Drilling tool

Claims (1)

A perforated rod provided with a spiral blade on the outer peripheral portion and used for perforating a ground or the like by attaching a drilling tool to the tip, wherein the upper surface of the spiral blade of the perforated rod is outside in the upright state of the rod Is formed as an inclined surface that gradually becomes lower , and a baffle member for scraping the earth and sand that hinders upward movement of the earth and sand at the outer peripheral portion of the cylinder shaft is provided on the cylinder axis between the upper and lower spiral blades. A perforated rod characterized by being provided .

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