JPH06101390A - Method and device for boring foundation ground - Google Patents

Abstract

PURPOSE:To bore very easily and certainly a hole for driving a foundation pile having a sturdy compacted circumferential wall surface, which is free from risk of earth fall or collapse under the ground when a foundation ground for construction is to be prepared, and eliminate earth lifting entirely. CONSTITUTION:An auger rod 3 having a conically inclining surface 5 and a precedingly excavating cutter 4 is installed in continuity below a casing 1 where. gradual/steep pressure earth curved surfaces 2 are alternately provided on the column surface in such a way as differing over and under relative to the axial direction. The earth from excavation to be made while the tip earth is rotarily excavated by the preceding cutter 4 is compacted to the circumferential wall surface of the hole through the compacting action and spreading due to the conically inclining surface 5. At the same time, the surplus earth of excavation is further compacted to the circumferential wall surface of the hole through the rotational action of the curved surfaces differing over and under of the gradual/steep pressure earth curved surface 2 of the casing 1 in pursuit of the auger rod 3. Thereby the hole is excavated for pile having a sturdy compacted wall surface under the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is extremely easy and reliable for constructing a hole for a foundation pile having a strong consolidation hole peripheral wall without fear of collapse of soil in the ground during construction of a foundation ground for construction. Along with it, the present invention relates to a method of drilling a foundation ground and a drilling apparatus for the purpose of completely non-removing earth construction.

[0002]

2. Description of the Related Art Conventionally, as a means for constructing a foundation pile on the ground without vibration and noise, a predetermined ground is prepared by using a pile hole construction device to drill a driving hole for the foundation pile. In the hole, a pile pillar or a core pile having an appropriate shape is placed, and thereafter, a coagulating material such as mortar is filled around the hole to improve the ground.

However, when excavating the ground as described above, for example, by using a drilling device having a spiral wing, the excavated soil in the ground is discharged to the ground through the peripheral gap of the spiral wing, which is a large amount. That is, the accumulated soil is accumulated on the ground, and countermeasures for the soil disposal have been a serious problem in the industry.

[0004]

SUMMARY OF THE INVENTION In view of such problems, the inventor has previously proposed Japanese Patent Nos. 1316177 and 115336.
Although the excavator by No. 1 was developed and was well received as a non-removal earthing construction method, the contents of the invention are both the conical inclined surface and the circumference of the spiral wing piece of the excavated soil at the tip to be excavated by the tip blade. By the synergistic action with the soil surface attached to the part, it is pressed against the hole peripheral wall to create a strong peripheral wall without collapse and at the same time the amount of excavated soil is significantly reduced by this pressing, which is almost no waste. Although the effect was expected and obtained, on the other hand, in the case of the invention, both of them are intended to prevent the earth from being discharged by clamping the peripheral wall of the hole in the lower part of the drilling device. However, depending on the softness of the ground, the geological relationship, etc., there is a problem regarding whether or not the compressing action is sufficiently performed in the ground. There was no

[0005]

SUMMARY OF THE INVENTION The present invention is intended to fundamentally solve each of the above-mentioned questions, and the peripheral wall of excavated soil can be reliably and easily provided over the entire length of the drilling hole regardless of the depth and ground conditions. Not only can it be tightened on the ground, but also in the middle layer, which is said to be the most important part for ground improvement, it is possible to more firmly and firmly press the hole peripheral wall, and at the same time, it was an initial issue. The main purpose is to solve all the problems of soil removal all at once. A conical auger with a stirring blade and a cutting blade below a specially shaped casing in which several blocks are integrally connected to each other in an appropriate length in the axial direction so that the soil curved surface and the excavation edge are sequentially different from each other. , While rotating the tip soil with a digging blade, the borehole soil is expanded by the conical inclined surface of the auger rod and pressed against the wall surface around the hole, and follows the auger rod. Due to the slow-acting soil curved surface of the excavating auger and the rotating action of the excavation edge, excess soil in the borehole is further pressed against the peripheral wall surface of the excavating hole, which is firmly pressed into the ground. Another object of the present invention is to provide a drilling method for a foundation ground and a drilling apparatus thereof, which is characterized in that a pile hole having a peripheral wall layer is drilled.

[0006]

The present invention has the above-described structure, and the drilling device is attached to the drilling machine and is driven and rotated to drill a hole in the ground. Due to the excavation in the ground, the tip soil under the auger rod 3 is bored by the tip blade 4, but the soil around the borehole is simultaneously stirred by the stirring blade 6 while the conical inclined surface 5 is inclined. The soil is firmly pressed against the hole peripheral wall without rising due to the action of the surface. At the same time as the pressing of the hole peripheral wall by the conical inclined surface 5 described above, the surplus hole peripheral surface soil is excavated by the rotating action of the excavation edge 2b of the pressure cutting auger 2 formed on the surface of the casing 1 that follows the auger rod 3. At the same time, by the action of the soil concavity curved surface 2a where the excavated soil continues, the hole peripheral wall surface is alternately hammered and squeezed like a trowel action, and is piled up extremely firmly in the ground while excavating. It is possible to carry out the drilling. Therefore, a rigid foundation ground can be easily and surely formed in the ground by press-fitting a core pile, mortar or the like into the pile hole to be dug by the above-mentioned means by using the conventional method of placing a pile pillar. In addition, due to the above action, a large amount of uplifted soil that should rise from the auger peripheral gap at the same time as conventional drilling is strongly pressed and formed in multiple layers on the hole circumferential wall, so collapse of the hole circumferential wall is completely prevented. Needless to say, it is possible to reduce the amount of soil discharged to the ground significantly, and to excavate a predetermined drill hole easily and reliably with almost no soil discharged.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows a casing 1 for the soil surrounding a borehole, which is the main part of the present invention, and has a moderately steep soil curved surface 2a and an excavation edge 2b on a columnar surface portion of a cylinder having an appropriate length and having the same diameter. One block A is formed by alternately forming integrally the formed auging auger 2 in the axial direction so that the positions of the respective slow and steep soil curved surfaces 2a and the boring edges 2b are different from each other. And connect several blocks to the required length. The above-mentioned pressure auger 2 which is a part of one block A
2 has a deformed triangular shape on the peripheral surface of the casing 1 and has loose circular curved surfaces on both sides thereof, and the digging edge 2b is formed on the projecting end.
It is formed in. Further, as shown in a part of FIG. 1, the auger rod 3 has a tip digging blade 4 having a spiral blade piece 4a having the same width as the casing 1 or a slightly wide width at the lower end portion of the rod shaft. A slender conical inclined surface 5 having a smaller diameter than the width of the cutting blade 4 is formed on the upper portion of the cutting blade 4, and the conical inclined surface 5 and the upper portion of the cutting blade 4 are provided at appropriate positions. It has a shape in which an appropriate number of stirring blades 6 having substantially the same diameter and width as the tip cutting blades 4 are attached. As the above-mentioned tip soil drilling device, it is possible to continuously connect and use any excavation device of any shape. As an example, as shown in FIG. 4, a part of the conical inclined surface 5 of the auger rod 3 is vertically deformed. It is also a consideration to form the concave groove portion 8 formed by cutting into a triangle so that the incision of the hole peripheral wall and the soil action can be performed more effectively at the same time. In some cases, the casing 1 may have a structure in which a water supply passage 7 for injecting water such as mortar or water is provided through the shaft center portion of the casing 1. Reference numerals 9 and 10 in the figure denote male and female connecting portions 8 and 9 for connection, which are respectively attached to both end portions of the casing 1 and the auger rod 3.

[0008]

As described above, according to the present invention, the casing is formed by alternately mounting several pressure cutting augers each having a curved surface on the pillar surface and a drilling surface so that the surfaces are vertically different from each other in the axial direction. Is a block A and several of them are integrally connected according to the required depth of the ground, and the auger rod 3 having the conical inclined surface 5 and the cutting edge 4 under the casing 1 having such a shape. As described in the section of action, the excavating blade 4 at the tip of the auger rod 3 excavates the ground while excavating the ground and at the same time expands the soil to be excavated. The blade 6 is agitated and pressed against the peripheral wall of the borehole by the action of the conical inclined surface 5 on the upper side to form a strong consolidating wall around the hole. Thus, the surplus soil that presses the hole peripheral surface is further excavated by the rotating action of the excavating auger 2 of the casing 1 which continues to excavate like a trowel surface action on the flat triangular compacted earth curved surface 2a of the excavating auger. However, the surplus soil in the peripheral wall portion of the hole that can be tapped in sequence is scraped off by the rotating action of the tip excavation edge 2b of the gently compressed soil curved surface 2a, and this is continued next to the next due to rotation and excavation. Due to the pressing action of the slow-pressing soil curved surface 2a of the press auger 2, the unstable part such as the concave part of the press surface is more firmly replenished and consolidated, and several continuous augers A, A, A are connected. Due to the action, irregularities such as unevenness of the hole peripheral wall at the time of construction, which was completely impossible in the conventional construction method, can be corrected to a constant surface, and a substantially uniform pile hole can be easily drilled over the entire length. I got it. In particular, according to the present invention, a casing is formed by integrally connecting several pieces of pressure augers having a steep and compressed soil curved surface and a drilling surface, which are connected to each other by making them different from each other. Even the peripheral wall of the pile hole can be easily clamped, and by using the surplus soil excavated underground, the peripheral wall of the drilled hole is firmly clamped, and the surplus to try to rise at the time of the clamping. There is an effect that the soil can be forcibly fastened, and thus a strong consolidation pile hole without fear of collapse can be easily and surely constructed without complete soil removal.

[Brief description of drawings]

FIG. 1 is an overall front view and side view of a drilling device according to the present invention.

FIG. 2 is a transverse sectional view taken along line AA of the same as above.

FIG. 3 is a transverse sectional view taken along line BB of FIG.

FIG. 4 is a diagram showing another embodiment of the excavation equipment portion.

[Explanation of symbols]

 1 Casing 2 Pressing auger a Slowly curved soil surface b Excavation edge 3 Auger rod 4 Cutting edge 5 Conical inclined surface 6 Stirring blade

Claims (5)

[Claims] 1. A block consisting of aforesaid auger having a curved surface and a digging edge attached to a pillar surface, which are integrally connected so that the curved surface and the digging edge are different from each other. A conical auger rod with a stirring blade and a cutting blade is connected to the bottom of a specially shaped casing formed by connecting it to the appropriate length in the axial direction, and the tip soil is rotated by the cutting blade. While drilling, the soil of the borehole is expanded by the conical inclined surface of the auger rod and pressed against the wall surface around the hole, and the curved surface of the excavating auger that follows the auger rod and the rotation of the excavation edge are rotated. A method for digging a foundation ground, in which excess soil in the hole is further pressed and fixed to the peripheral wall surface of the excavation hole that can be pressed by the action, so that a pile hole having a strong consolidated peripheral wall is drilled in the ground. 2. A moderately steep soil curved surface and an excavation edge having a flat triangular shape on the peripheral surface of the auger casing, and a circular curved surface with loose sides on both sides of the surface, and the triangular tip portion having an excavation edge with a diameter larger than the shaft diameter. A drilling device for a foundation ground, which is integrally formed with a base. 3. A pressing auger formed by forming a moderately steep soil curved surface and a digging edge on a pillar surface is connected to the axial direction so that the positions of the gently sloping soil curved surface and the digging edge are sequentially different from each other. A drilling device for a foundation ground, characterized in that several blocks are integrally connected to each other to have an appropriate length. 4. An auger in which a tip digging blade is formed at a tip end portion, a conical inclined surface is formed on a shaft portion, and several stirring blades are appropriately provided on the conical inclined surface and the upper portion of the tip cutting blade. A drilling device for a foundation ground, wherein a rod is integrally connected to a lower surface of an auger casing, which is provided with a large number of gently swollen soil curved surfaces and drilling edges on the pillar surface according to claim 3. 5. A drilling device comprising a casing and an auger rod integrally connected to each other according to claim 4, wherein the lower end portion of the auger rod has the same width as the diameter of the casing.
Alternatively, a tip digging blade having a spiral blade of a wide width is attached, and a compressed soil portion of a slender conical inclined surface having a smaller diameter than the widening width of the tip digging blade is formed above the rod axis. A drilling device for a foundation ground, in which a plurality of stirring blades having substantially the same diameter and width as the tip digging blade are additionally provided at appropriate places on the conical inclined surface and the rod shaft portion.