JPH1037650A - Drilling device for foundation ground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extremely easily and reliably drill a pile hole having a firm hole wall having no fear of collapse occurring in a ground almost without discharging drilled soil in a ground to a ground. SOLUTION: The whole of an auger head 1 provided with a tip part with a tip drilling blade 5 in a proper shape and at an upper part with a screw vane piece 2 is formed approximately in a conical shape. Flat notch surfaces 4 and 4 recessed to a specified depth are formed in the front and rear surfaces or the right and left surfaces or the four surfaces of the screw vane piece 2. Further, a plurality of agitation blades 6, 6, and 6 each having a cutting edge a rotation locus width (b) of which is at least approximately the same as a vane width diameter (a) are attached on the flat notch surfaces 4 and 4. Further, the agitating blades 6, 6, and 6 are disposed in recessed flat notch surface 4 and 4 formed in the front and rear of the screw vane blade piece 2 and a plurality of the agitating blades 6, 6, and 6 are longitudinally disposed along the spiral direction of the screw vane piece 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil improvement method for construction and the like, wherein a pile having a solid hole wall is hardly dislodged in the ground without almost excavating the underground excavation soil. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device for a foundation ground that drills a hole very easily and surely.

[0002]

2. Description of the Related Art Conventionally, in a foundation ground improvement method for digging a foundation ground such as a building, a foundation in which a pile hole having a predetermined diameter is to be constructed while firmly pressing a peripheral wall surface of the hole when excavating a pile hole in the ground. Various pile construction devices have been developed. In other words, the inventor of the present invention presses the peripheral wall surface of the hole with a conical screw auger in which a pressing edge is formed at the peripheral portion of the screw blade piece first to form a solid pressure-tight wall. A tightening device (Japanese Patent No. 1136177) is also provided. A flat notch is formed by recessing the front and rear surfaces of the screw auger, and the peripheral wall surface of the hole which can be tightened by the pressing edge and the conical surface of the screw blade piece. Excavation equipment for the ground to create a stronger consolidated wall while preventing falling soil (Japanese Patent Application No. Hei 5-3480)
No. 04) and has been well received in various places.

[0003] However, most of these drilling devices are intended to simply press without excavating the excavated soil generated at the time of the excavation on the peripheral wall surface of the excavated pile hole, so that the soft stratum is formed. Even if an efficient consolidation effect can be obtained in the case, if the destination layer is made of a hard layer such as clayey or hard rock, a part of the soil mass that has not been compacted is a flat notched surface of the screw auger. And accumulated in the space between the hole and the peripheral wall of the hole, solidifying it, causing a serious hindrance to the rotation of the screw, and further removing the solidified soil between the grooves of each screw blade. It was necessary to take considerable effort. In addition, it has been found that there is a serious drawback in that the solidified mass is more strongly solidified in the ground and drops to the bottom of the pile hole together with the subsequent solid mass, thereby burying the pile hole for drilling. is there.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention consolidates excavated soil into a peripheral wall, and at the same time, disturbs any hard soil mass in a borehole to cut off frictional resistance and to reduce foundation resistance. The purpose of this study is to create a very strong pile with extremely simple and reliable construction. It is an object of the present invention to provide a foundation ground excavation apparatus whose main purpose is to perform construction reliably and completely without noise irrespective of the hardness of the ground layer.

[0005]

As a means for achieving the above object, an excavation apparatus for a foundation ground used in the present invention has, as shown in FIG. The overall shape of the auger head 1 on which the screw blade pieces 2 are attached is formed in a substantially conical shape, and flat notched surfaces 4, 4 recessed to a constant depth are formed on the front and rear surfaces or the left and right surfaces of the auger. The conical auger is used in a soil excavation device that presses the ground around the pile by the rotating action of the cutout surfaces 4 and 4 and simultaneously prevents the suction action generated when the auger is pulled out to prevent collapse in the pile hole. It is characterized in that several disturbing blades 6, 6, 6 are attached to flat notched surfaces 4, 4 recessed in the front and rear surfaces of the head 1. In addition, a tip dug blade 5 having an appropriate shape is formed at the tip portion, and a pressed soil edge c having an appropriate thickness is formed around the blade. A conical auger head 1 integrally provided with a screw blade piece 2 is provided with flat notches 4, 4 which can be recessed to a certain depth on the conical front and rear surfaces or left and right surfaces. The four and four disturbing blades 6, 6, 6 are provided with a rotation locus width b of each blade edge at least substantially the same as the blade width diameter a.

[0006] Further, the above-mentioned disturbing blades 6, 6, 6 are attached to the flat notched surfaces 4, 4 which are notched on the auger head 1 front and rear surfaces and the left and right surfaces along the spiral direction of the screw blade piece 2, In addition, the present invention is characterized in that the number of the disturbing blades 6, 6, 6 is alternately arranged on the front and rear surfaces of the flat notched surfaces 4, 4, and is arranged.

[0007]

Next, a description will be given of an example of construction using the device. First, the entire device is set on a pile driver and built on a predetermined ground, and then the power is driven. The blade 5 and the screw blade 2 rotate and excavate while disturbing the tip ground. Further, the excavated soil is pushed upward while the excavated soil is pushed upward by the synergistic action of the pressed edge c formed on the outer periphery of the screw blade piece 2 with the rotation of the screw blade piece 2 and the conical surface of the auger head 1. It is firmly expanded and pressed against the peripheral wall f. Further, the peripheral wall surface of the hole is cut at the corners of the flat cut surfaces 4 and 4 which can be recessed in the front and rear surfaces of the auger head 1 at the same time as the rotary excavation as described above, and at the same time, the cut portion is part of the flat cut surface 4 of the next rotation. That is, the excavated soil is dug into the ground to a predetermined depth while alternately repeating operations such as pressing, cutting, and further pressing the excavated soil to the hole peripheral wall surface f by continuous rotation of the auger head 1. According to the present invention, the disturbing blades 6 and 6 attached to the flat notches 4 and 4 are rotated together with the excavation of the auger head 1 as described above, and the surplus soil which can be pressed against the peripheral wall f of the hole is filled with the concave notch on the flat notch 4. It is possible to obtain a strong ground layer by further crushing and disrupting the surplus soil into the hole peripheral wall f where the excess soil can be consolidated and pressurized first in the space G. In addition, it is required that rotary digging adapted to the soil is performed by attaching the disturbing blades 6, 6, 6 to the flat cutout surfaces 4, 4 along the screw blade piece 2 or alternately arranging the front and back surfaces. It goes without saying that stronger compression and disturbance can be easily obtained. . By pulling up the entire apparatus from the drilled hole d, the mortar cement is filled in the hole and a steel core is inserted, or an existing pile such as a concrete pile is inserted and cast into the ground. It is possible to reliably construct a basic foundation ground. In particular, in the present invention, the piercable hole d
Because the hole peripheral wall f of the hole is firmly clamped, there is a concern that the pile hole d may collapse during the construction work, and that the hole d may be buried in the earth mass. As a matter of course, it is possible to completely prevent collapse due to the suction action in the hole generated when the rod is pulled out.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an auger head having a substantially conical overall shape, having a cutting edge 5 at a lower end thereof, and A screw blade piece 2 having a blade diameter a of a constant diameter is integrally provided. At the peripheral edge of the screw blade piece 2 is formed a pressed soil edge c having a constant wall pressure.
Of the blade width a of the upper and lower sides are approximately the same diameter. The front and rear surfaces or left and right surfaces of about 3/1 of the upper part of the auger head 1 having such screw blade pieces 2 are formed as shown in FIG. 3, or each of the left and right front and rear surfaces shown in FIG. Several flat notched surfaces 4 and 4 are formed by recessing to an appropriate depth, and several disturbing blades 6, 6 and 6 are attached to each of the flat cut surfaces 4 and 4 having the above-mentioned shape. It is to be noted that the shape of the above-mentioned disturbing blade 6 is usually optimally one having a longitudinal width of about 10 cm and a wall pressure of 50 mm, and the outer cutting edge dimension is at least longer than or equal to the blade width diameter a of the screw blade piece 2. It is formed in a diameter. It is also conceivable that the shape of the disturbing blade 6 is formed in a curved shape on one side in order to correspond to the earth pressure resistance or the like. In the drawing, reference numeral 7 denotes a mortar infusion tube that can penetrate the rod shaft 3 vertically, and 8 denotes a mortar injection hole 8.

In the present invention, the disturbing blades 6, 6, 6 provided on each of the flat notched surfaces 4, 4 are provided so that the rotation locus width b of the cutting edge is at least substantially the same as the blade width diameter a. At the same time, by forming the disturbing blades 6, 6, 6 along the spiral direction of the screw blade piece 2, the excavating action during excavation can be performed more smoothly.

Further, the disturbing blades 6, 6, 6 are arranged on the front and rear surfaces of the flat cutout surfaces 4, 4 of the auger head 1, or alternately on the left and right surfaces and the like, with the number of the disturbing blades 6 being alternately changed. This makes it possible to simultaneously obtain the optimum excavation function and disturbance function according to the excavated soil such as hardness and softness.

[0011]

The drilling device for foundation ground according to the present invention comprises:
Auger head 1 whose overall shape is formed in a substantially conical shape
A screw blade piece 2 for forming a pressed soil edge c at the periphery is provided, and a part of the front and rear surfaces or left and right surfaces of the auger head 1 is recessed to form flat notched surfaces 4 and 4. Since a plurality of disturbing blades 6, 6 and 6 are attached to each of 4, 4 and 4, the excavation by the auger head 1 and the pressing soil edge c around the screw blade 2 and the conical auger head surface , The excavated soil is firmly pressed against the hole peripheral wall surface, and the pressed soil wall is further firmly pressed at each edge of the flat notched surfaces 4 and 4 while cutting frictional resistance, resulting in strong consolidation. The wall can easily and reliably be requested. Further, in the present invention, since the flat notched surfaces 4 and 4 which can be recessed in a part of the screw auger are formed, a space is formed in the hole, and the suction action is generated by the space when the auger is pulled out of the auger. There are no worries that the walls will collapse and fall down, and several flat blades 6, 6, 6 will be added to the flat notched surfaces 4, 4 to excavate the debris around the holes with the screw blade pieces 2. At the same time, the soil is compacted on the hole wall surface, and the strong soil such as debris, earth mass, clay mass and the like accumulated at the bottom of the hole is surely crushed and agitated. It may be possible to create a ground layer.

According to a third aspect of the present invention, the disturbing blade 6,
The rotation locus width b of each of the cutting edges 6, 6 is provided at least approximately the same as the blade width diameter a, and the disturbance blades 6, 6, 6
Of the screw wing piece 2 along the spiral direction, it is possible to obtain a better excavation in the direction of excavation, and also to completely disturb and pulverize the compacted solid mass, thereby achieving a more effective rotation pressure. It goes without saying that it is possible to seek a tightening. .

Further, as described in the fourth aspect, the number of the disturbing blades 6, 6, 6 attached to the flat notched surfaces 4, 4 is alternately changed before and after, so that the disturbing blades 6, 6, 6 are attached. Even if there is, it has a remarkable effect, such as incision and disturbing, whereby a stronger consolidated wall can be formed.

[Brief description of the drawings]

FIG. 1 is a front view of a drilling device for foundation ground according to the present invention,

FIG. 2 is a side view of the same,

FIG. 3 is a cross-sectional view of a main part of the above.

FIG. 4 is a cross-sectional view of a main part of the above according to another embodiment;

FIG. 5 is a diagram of a dug-hole body by the above device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Auger head 2 Screw wing piece 3 Rod shaft 4 Flat notch surface 5 Cutting edge 6 Disturbing blade 7 Mortar infusion pipe 8 Mortar injection hole

Claims (4)

[Claims] 1. An auger head 1 having an appropriately dug edge 5 at its tip and having a screw wing piece 2 attached to its upper part is formed in a substantially conical shape, and the front and rear surfaces or the left and right surfaces of the cone are formed. The flat notches 4 and 4 are formed to be recessed to a certain depth, and the rotation of the flat notches 4 and 4 presses the ground around the pile and at the same time prevents the suction effect that occurs when the auger is pulled out. In a soil excavation apparatus for preventing collapse in a pile hole, several disturbing blades 6, 6, 6 are provided on flat notched surfaces 4, 4 formed in front and rear surfaces of the conical auger head 1, respectively. Drilling equipment for foundation ground, characterized by being attached. 2. An appropriately shaped tip digging blade 5 is formed at the tip, and an embossed edge c having an appropriate thickness is formed around the blade periphery.
Is a conical auger head 1 integrally provided with a screw blade piece 2 having a screw blade width dimension a having the same upper and lower diameters. In the excavation device for the foundation ground provided with the notched flat notches 4 and 4, several disturbing blades 6
2. The excavation device for foundation ground according to claim 1, wherein said cutting edge has a rotation locus width b of said cutting edge which is at least substantially the same as said blade width diameter dimension a. 3. A conical auger head 1 having an appropriately shaped tip digging blade 5 at its tip and a screw blade piece 2 provided on the top thereof has a constant depth on said conical front and rear surfaces or left and right surfaces. In a base ground excavation device provided with flat notches 4 and 4 which can be recessed, several disturbing blades 6, 6 and 6 are provided on the front and rear flat notches 4 and 4 with the rotation locus width of the cutting edge. 2. The apparatus according to claim 1, wherein b is at least substantially the same diameter as said blade width diameter a, and said perturbation blades 6, 6, 6 are provided along the spiral direction of the screw blade piece 2. Drilling equipment for foundation ground as described. 4. A plurality of disturbing blades 6, 6, 6 are provided on a flat notched surface 4, 4, which can be recessed to a constant depth in the conical front and rear surfaces or the left and right surfaces of the conical auger head 1. 2. The trajectory width b is at least substantially the same diameter as the wing width diameter a, and the number of the turbulence blades 6, 6, 6 is changed so as to be alternately changed between front and rear. Drilling equipment for foundation ground.