JPH07189248A - Method of pit excavation construction of foundation ground and device thereof - Google Patents

Abstract

PURPOSE:To excavate a pile pit easily in the ground positively, and to compact a pit wall firmly while preventing the falling and collapse of soil in the pit. CONSTITUTION:A ground pit excavator, in which a screw auger 4, shape of which is formed in an approximately conical shape and in which screws 5 having approximately the same diametral size width as screw blade pieces 2 are annexed to the upper and lower sections of the conical-shaped surface (b) while flat notched surfaces A are recessed and formed to the front and rear surfaces and front-rear left and right surfaces of the screws, is continuously connected integrally to the upper section of an auger head 1, in which a front excavating edge 3 is mounted at a front end section and the screw blade pieces 2 having constant diametral size width alpha are arranged in parallel and formed integrally, is hung from a pile-driver and built in the specified ground. The ground pit excavator is turned and driven by power, and the pit of the ground is excavated. Air gap sections are shaven in an excavated pit by the action of the flat notched surfaces A of the surface of the screw auger 4, and suction action generated at the time of the extraction of the auger is inhibited while reverse suction force is generated in the pit and a collapse phenomenon generated in the pit is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is very easy and reliable to dig a foundation ground for construction, prevents collapse in the pit, and constructs a ground layer having a stronger hole wall. The present invention relates to a method of drilling a foundation ground and its equipment.

[0002]

2. Description of the Related Art Conventionally, in the foundation ground construction method for buildings and the like, at the same time as excavating a pile hole having a predetermined diameter in the ground, the hole wall is more firmly pressed to prevent the hole wall from collapsing and to be discharged to the ground. A ground drilling method and its equipment have already been developed to reduce the amount of soil.

[0003]

That is, the inventor of the present invention firstly uses a conical screw auger that forms a compacted soil edge on the periphery of a screw wing piece at the same time as excavating the soil to excavate the excavated soil when excavating the soil. By the action of the conical surface and the soil edge, the hole peripheral wall is compacted to form a stronger hole wall, and the amount of soil lifted to the ground is minimized. No.) and an auger rod peripheral surface are formed into a triangular or quadrangular surface, and the forming surface is used to press the excavated soil against the peripheral portion of the drill hole to form a strong hole wall (Patent No. Invented No. 1308022) and was well received in the industry. However, both of the above devices have the advantage that they can spread and press the excavated soil to the periphery of the hole to create a strong hole wall with almost no soil discharge, while the hole wall and auger surface are Since they are in close contact with each other, there is no escape area for air, which causes a sudden suction force in the excavation hole, which causes a drawback that the hole wall that can be firmly clamped collapses at the time of withdrawal. In addition, even if it is possible to prevent some collapse by slowing down the pulling work a little, it is inevitable that it will hinder the work, and speed can be increased in order to improve work efficiency. It became clear that the above-mentioned suction force was further increased by upsizing, and it was impossible to insert the pile pillar at all. According to the present invention, by positively forming the void c as an air escape area in the ground during the underground excavation, a reverse suction force is generated in the hole to prevent collapse in the hole and the void. Its main purpose is to construct a support ground for laying foundation piles having a stronger hole wall by filling a setting material such as mortar in c.

[0004]

As a means for achieving the above-mentioned object, a drilling device according to the present invention is provided with a tip-shaped cutting blade 3 having an appropriate shape at its tip end, as shown in the drawings by way of example. In addition, the whole shape of the auger head 1 having a plurality of screw blades 2 integrally attached to the upper portion is made substantially conical, and the screw blade 2 is formed on the conical surface b.
A screw auger in which a screw 5 having substantially the same diameter α as that is attached is provided, a soil compaction surface 5 ′ is formed on the peripheral edge of the screw 5, and flat cutouts A are further provided on the front and rear surfaces of the screw or front, rear, left and right surfaces. It is an object of the present invention to provide a boring device for a foundation ground, wherein the auger head 1 and the auger head 1 are detachably and integrally connected to each other.

[0005]

Next, a description will be given of an example of digging a foundation ground by the above-mentioned device. First, the whole device is set on a pile driver and placed on a predetermined ground, and then the rotation of the earth auger shaft 6 is performed via power. At the same time, by driving and rotating the auger head 1 and the screw auger 4, the tip cutting blade 3 at the tip of the auger head 1 is rotated, and the tip ground is disturbed to advance. Further, the screw blade piece 2 and the screw auger 4 rotate at the same time as the excavation, and the outer peripheral surfaces of the upper and lower screws and the conical surface b respectively push the excavated soil upward while expanding it to the hole peripheral wall surface. Tighten.
Simultaneously with such rotary excavation, the hole periphery is incised at the corner edge portion of the flat notched surface A formed in the outer periphery of the screw 5 of the screw auger 4, and at the same time, the soil surface 5'and the conical surface formed on the outer periphery of the peripheral edge of the screw 5 are formed. By the action of the above, it is possible to surely and easily construct a pile hole for laying a foundation pile having a strong consolidation hole wall by strongly pressing the cutting soil around the hole in the predetermined ground. . Particularly, in the present invention, since the flat notch surface A is provided on the screw auger 4 surface at the same time as the hole wall compression, the space c is formed between the auger and the hole wall, and the space c is formed to form the auger. The mortar pillars can be easily installed in the ground by naturally introducing muddy soil such as air that is congested between the hole walls to suppress the suction force inside the holes during removal and filling the voids c with mortar. It is possible to carry out the construction reliably.

[0006]

Embodiments of the present invention will now be described in detail. Reference numeral 1 is a spiral wing piece 2 having a constant diameter dimension α in its peripheral portion.
Is an auger head to which the cutting blade 3 can be integrally attached to the tip portion. The reference numeral 4 indicates that the entire upper and lower peripheral surfaces are formed into a substantially conical surface b, and that the conical surface b has substantially the same diameter and width as the diameter width α of the spiral wing piece 2 of the tip auger head 1 and its peripheral portion. A screw auger 4 which is integrally provided with a screw 5 having a compacted soil surface 5'having an appropriate meat pressure.
Is. Further, the front and rear parts of the screw 5 attached to the surface of the conical screw auger 4 are notched to a certain depth in the vertical direction, and flat cut surfaces A and A are formed in the front and rear of the screw. Is formed in. The drilling device according to the present invention uses a screw auger 4 coaxially and integrally connected to the upper portion of the auger head 1 having the above-described shape, and further connects the screw auger 4 to the upper portion of the screw auger 4 at the time of construction. An auger shaft 6 having an appropriate shape such as a circular cross section, a triangle, a quadrangle, etc. is connected through a seat 9 and used. Reference numeral 7 is a mortar injection pipe that extends vertically through the auger shaft 6, the screw auger 4, and the auger head 1. The lower end of the mortar injection pipe is connected to a mortar injection hole 8 that is opened at the tip of the head.

Further, the screw 5 of the screw auger 4
As shown in FIG. 3, the flat notch surface A formed in a portion may be provided on both left and right side surfaces together with the front and rear surfaces, that is, the flat notch surface A may be recessed in a substantially quadrangular shape with a part of the screw 5 left. This is a consideration.

[0008]

As described above, the ground drilling device according to the present invention is a screw which is formed by flatly notching the front and rear portions of the screw 5 in the upper portion of the auger head 1 to a certain depth to form flat cut surfaces A, A. Since it is made up of auger 4 connected in series,
When excavating into the ground, a predetermined diameter dimension α
It is possible to reliably and easily excavate the void c part, and the creation of such a void c serves as an escape area for the air in the hole, which was conventionally caused by the suction force in the hole that is generated when removing the auger. To prevent the collapse of
And contrary to the above, it also has the effect of pulling back the suction force into the ground and introducing muddy water, mud soil, etc. as well as the air in the ground,
Therefore, there is a remarkable effect that the subsequent work can be performed extremely easily and surely. Moreover, the above-mentioned soil surface 5'of the screw 5 attached to the conical surface b of the screw auger 4 and the conical surface b
By the action of, the excavated soil in the ground is moved upward, and the soil is expanded and clamped around the excavation hole to form a strong consolidation wall, and at the same time it has the effect of significantly reducing the amount of excavated soil. .

Further, as described in claim 2, it is adapted to the construction ground or the like by providing a concave cutout on both left and right side surfaces of the screw 5 of the screw auger 4 along with the front and rear surfaces, that is, a substantially rectangular flat cutout surface A. The frictional resistance generated during construction is also smaller than that of the recessed shape on the front and rear surfaces, and smoother and better rotary excavation can be sought.

[Brief description of drawings]

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

[FIG. 2] Same as the above, a cross-sectional view of the main part

FIG. 3 is a sectional view of the same as above according to another embodiment;

FIG. 4 is a ground excavation diagram.

[Explanation of symbols]

 1 Auger head 2 Screw auger A Flat cut surface

Claims (3)

[Claims] 1. An auger head 1 formed by integrally forming a blade portion 2 at the tip and a screw blade piece 2 having a constant diameter dimension α on the upper portion, and having a substantially whole shape. A screw 5 having a conical shape and having substantially the same diameter and width α as the screw blade 2 above and below the conical surface b and having a compressed soil surface 5'at its peripheral edge is attached to the front and rear surfaces of the screw 5 or A screw auger 4 having a flat cutout surface A that can be recessed at a constant depth is formed on the front, rear, left, and right surfaces so as to be coaxially and integrally connected. Further, an auger shaft 6 is provided on the upper portion of the screw auger 4.
A ground drilling device that is connected to a pile driving machine is hung on a pile driving machine and built in a predetermined ground, and an auger and a head are driven to rotate by power to drill a ground, and the screw is used. Due to the action of the flat cut surface A that is recessed in the auger 4 surface, a void c is cut in the drill hole to suppress the suction action that occurs when removing the auger and at the same time to generate a reverse suction force in the hole. A method of drilling a foundation ground that tries to construct a pile hole for pile driving on a predetermined ground while preventing the collapse phenomenon that can occur. 2. A tip drilling blade 3 having an appropriate shape is attached to the tip end,
In addition, the whole shape of the auger head 1 having a plurality of screw blades 2 integrally attached to the upper portion is made substantially conical, and the conical surface b has substantially the same diameter as the screw blades 2. A screw auger 4 having a width α and a screw 5 formed by forming a compressed soil surface 5'on the peripheral edge of the screw 5 and a flat notched surface A which can be recessed at a constant depth is formed on the front and rear surfaces of the screw 5. A boring device for a foundation ground, which is detachably and integrally connected to the auger head 1. 3. An auger head 1 having an appropriately shaped cutting blade 3 attached to the tip thereof and several screw blades 2 integrally attached to the upper portion thereof. A screw 5 having the same shape as that of the screw blade 2 and having a diameter α substantially the same as the screw blade 2 is attached to the conical surface b. 3. A drilling device for foundation ground according to claim 2, wherein screw augers 4 each having a flat notched surface A having a substantially square cross section are formed continuously on four sides.