JPH11117651A - Method and device for drilling hole in foundation ground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely drill a pile hole having a strong peripheral wall suitable for the ground, whether the ground is soft or not, and not to discharge each completely, using a foundation ground construction method and device. SOLUTION: First, an appropriate auger rod A which is circular or in the form of a polygon, such as a triangle, square, or hexagon, is coaxially connected to the top of a drilling device during ground drilling, is hung on a pile driver, and is power-driven, and the drilling device is rotated along with the auger rod A to perform rotation drilling. In this case, the part of the ground below a drilling/agitating part 1 is drilled and enlarged, and muck and pebble is crushed and agitated by a following agitating/crushing part. Further, as the muck and pebble crushed and agitated is developed and compacted into the circumferential wall of a hole by the rotary action of the conical inclined face (a) of the auger head 7 of a following compacting part and a screw blade piece 6, a pile hole having a strong hole wall layer is drilled in the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for constructing a foundation ground, which makes it possible to easily and surely excavate a pile hole having a hard hole peripheral wall suitable for the ground, regardless of any soft ground, and to completely remove soil. The present invention relates to a target foundation ground excavation method and its equipment.

[0002]

2. Description of the Related Art A so-called vibration-free and noise-free construction method is used in a foundation ground construction method such as a construction in which a rotary blade is drilled in the ground with a screw blade, and a pillar is driven into the borehole to form a solid ground. The loose screw method is mainly known, but since this method is merely for the purpose of excavating the ground, the above method is to excavate the ground at the bottom of the hole and the ground around the hole at the time of the underground excavation. In addition to the above-mentioned excavation, a large amount of excavated debris will be excavated on the ground, and considerable expenditure and labor will be required for the excavation. It had serious drawbacks such as the need.

[0003]

In order to solve such a drawback, the inventor of the present invention first formed the entire shape of the auger head into a conical shape, and had a pressing edge on the conical head surface. At the same time as the underground excavation, the excavated soil is expanded and clamped to the hole peripheral surface by the synergistic action of the conical surface and the consolidation edge to create a strong consolidation layer and discharge the ground to the ground. A specially shaped ground excavator with a minimal amount (Patent No. 1136177) was developed, and it has gained considerable popularity among the industry. However, recently, the above-mentioned drilling equipment has a tremendous effect of firmly pressing the hole wall and preventing collapse of the drilling hole during work, but on the other hand, if only the screw method is used alone, the purpose is For example, rocks or clay gravels penetrate between the screw blades during work, depending on the soft ground of the construction ground to be worked, and this solidifies more strongly with the auger excavation, causing a considerable load and finally spinning, etc. It turned out to have a serious drawback that a smooth excavation hole could not be obtained.

[0004]

SUMMARY OF THE INVENTION The present invention focuses on such a drawback, and is different from the purpose of merely pressing the peripheral wall of the hole. In the case of unfolding excavated soil and soft ground, kneading and disturbance of the above excavated soil, and in hard ground such as rock clay, disruption and crushing,
Further, the above-mentioned operations such as expanding and pressing the crushed debris together with the excavated soil together with the excavated soil are alternately and continuously repeated to easily and surely excavate any hard or soft ground layer. ,
Its main purpose is to seek the creation of solid foundation ground in the ground. As a means for achieving the above-mentioned object, a drilling apparatus according to the present invention includes, as shown in the drawings, an example in which a cutting edge 2 is provided below the tip of an auger shaft 1 and a screw is provided above the cutting edge 2. Drilling stirrer I with wings 3
And a disintegrating and crushing section II on which a plurality of disturbing and crushing rods 4 are attached above the stirring section I. Further, the entire auger head 7 is formed in a conical shape above the disturbing and crushing section II, and the conical inclined surface is formed. a, which has a structure in which a screw wing piece 6 and an intermediate blade 5 are attached to and formed with a clamping part III, which is integrally disposed coaxially with the auger shaft 1, respectively. An appropriate shaped auger rod A is connected on the upper coaxial side of the drilling apparatus,
This is hung on a pile driver to drive the power and auger rod A
When drilling the drilling equipment with the drill,
Excavation and crushing section that excavates and expands the ground below the ground and follows the ground
In II, the excavated debris is crushed and disturbed, and the crushed and disturbed debris is further conveyed to the auger head 7 conical slope a of the subsequent pressing part III.
Drilling a pile hole with a strong hole wall layer in the ground while expanding and tightening the hole peripheral wall by the rotation action of the screw blade piece 6 and provide a wide range of drilling methods for the foundation and ground. It is assumed that. Further, notch portions 3 ｀ and 6 ｀ are cut out around the screw blades of the upper and lower screw blade pieces 3 and 6 or any one of the screw blade pieces 3 and 6, and the above-mentioned disturbance, the disturbance by the crushing rod 4, The crushed excavated debris can be finely pulverized more effectively, and the hard debris around the hole can be more reliably crushed. In addition, the excavation stirrer I, the turbulence crusher II, and the pressurizing unit III are freely extensible and expandable, and the excavation stirrer I, the turbulence crusher II, and the pressurization unit III can be freely changed according to the soft material of the ground. It is also possible.

[0005]

A description will now be given of an example of drilling of a foundation ground using this apparatus. First, an auger rod A having an appropriate shape such as a round, triangular, square, hexagonal or the like is formed on the auger head 7 in accordance with the drilling ground. It is interlocked and hanged on a pile driver that can be fixed on a predetermined ground. Thereafter, in driving the power, the drilling device rotates with the rotation of the auger rod A, and the leading edge 2
Excavates underground while excavating the ground below. In such a state, the lower screw blade piece 3 spreads and agitates the excavated debris, lifts the expanded debris upward, and further excavates underground. Hard debris such as rocks and clay lumps around the hole that can be expanded simultaneously with the excavation are disturbed and crushed by the action of the rotating turbulence and the crushing rod 4 following the screw blade pieces 3, and this is followed by the rotating auger. By the action of the conical inclined surface a of the head 7 and the pressing edge b of the screw blade piece 6, the hole surrounding soil surface, which can be pressed against the hole surrounding wall, is more firmly pressed and consolidated, and a solid hole wall layer in the ground. Can be reliably formed without collapsing the pile hole having the hole. Further, in the present invention, by using a polygonal auger rod A such as a triangle, a square, or a hexagon as the auger rod A connected to the upper part of the apparatus together with the above-mentioned drilling work, the hole is excavated in the ground and firmly pressed. It goes without saying that a stronger hole peripheral wall can be obtained by intermittently hitting the hole peripheral wall surface by the rotating action of the edge of the auger rod A according to the sedimentation of the apparatus. In addition, depending on the soft material of the excavated ground, etc., the notch portions 3 ｀ and 6 に are notched in a part of the periphery of the upper and lower screw blades 3 and 6 or one of the screw blades. Disturb,
The crushed excavated debris may be further finely pulverized, and the pulverized debris may be pressed against the peripheral wall of the hole to form a stronger consolidation layer. Further, depending on the target geology and the like, it is possible to easily excavate a digging hole suitable for the ground by disturbance, increase / decrease of the number of the crushing rods 4 attached, change of the attachment location, extension, or the like.
The present invention is for constructing a foundation hole in the foundation ground on the predetermined ground by the above-described process, and filling and filling a consolidating material such as mortar in the excavation pile hole to form a mortar column, and forming the existing pile, H in the mortar column. By driving core steel such as steel pillars as core piles, it is possible to easily and reliably create a strong foundation ground under the ground.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ground excavator according to the present invention is roughly composed of an excavating stirrer I, a turbulent crusher II and a pressing part III. Hereinafter, the embodiment of the above components will be described in detail with reference to the drawings. The excavation stirrer i is provided with a cutting edge 2 having several cutting edges at the lower end of an auger shaft 1 having an appropriate length. Several screw blade pieces 3 are integrally provided above the excavation blade 2. Disturbing and crushing part II is the screw blade piece 3
Immediately above, several disturbing and crushing rods 4 are formed radially outward at appropriate intervals around the auger shaft 1.
The pressing portion III has an auger head 7 formed in a substantially conical shape as a whole, an intermediate blade 5 below, and a concavity edge b having an appropriate thickness on the conical inclined surface a. The screw blade 6 to be formed is integrally provided, and the excavating and stirring part I, the turbulence crushing part II, and the pressing part III, which form the above, are integrally formed coaxially through joint parts d and d. Alternatively, they are interchangeably connected and connected. In the present invention, it is preferable that the outer diameters of the upper and lower screw blade pieces 3 and 6 are arranged in a rotational locus b having substantially the same diameter in the vertical direction. In some cases, a more effective excavating function can be expected by providing the above-mentioned disturbing and crushing rods 4 with several auxiliary blades 4 ｀ and 4 ｀ that are slightly inclined in the excavation direction.

Further, as an additional embodiment of the present invention, cutout portions 3 ｀, 6 ｀ are appropriately provided in the periphery of the upper and lower screw blade pieces 3, 6 or a part of the screw blades on either side,
At the same time as incising the surrounding hard ground, it may be possible to seek stirring and fine grinding of excavated debris.

In the present invention, in a normal case, as shown in the example, the excavation / stirring unit I is set downward,
Although it is connected and arranged integrally and coaxially with the pressing part III, it is not limited to such an arrangement,
For example, depending on conditions such as the softness of the ground for the construction purpose, the above arrangement is arranged such that the disturbing and crushing part II is placed above the pressing part III, or the disturbing and crushing rod 4 is placed immediately above the excavating blade 2 or the pressing part III It is also possible to arrange the respective arrangements so that the position of each arrangement can be adjusted freely, for example, by adding several disturbances and crushing rods 4 in the middle of the above.

[0009]

According to the present invention, as described above, components having completely different functions from those of the excavation stirrer I, the turbulent crusher II, and the presser III are integrally disposed coaxially. With the excavation of the ground, the ground is expanded while stirring, and the hard ground such as rocks as well as the excavated debris under the ground is strongly crushed and disturbed. The above-mentioned operations such as compression, expansion, stirring, crushing, disturbance, and compression are continuously and alternately repeated by coaxial rotation to excavate the ground. It is possible to completely resolve the concerns of doing so, and to excavate a solid pile hole in the ground with almost no soil removal. In particular, the present invention has a remarkable effect such as the fact that the perturbation and crushing rods 4 are provided between the upper and lower screw blades 3 and 6 so that the pile hole can be reliably excavated without any load resistance on any hard ground. ing.

Further, in the present invention, a notch portion 3 is provided at an appropriate portion of the upper and lower screw blades 3, 6 or a part of the periphery of the screw blade on either side.
By notching ｀ and 6 ｀, not only the surrounding hard ground can be more reliably cut, but also finer crushing can be obtained at the same time as stirring the excavated rubble, so There is an advantage that a pile hole having a hole peripheral wall that can be pressed can be formed. Moreover, the notch portions 3 #, 6 # provide a smooth excavation work with less frictional resistance during excavation, and the notch portions 3 #, 6 # become a space portion,
The opening of such a space portion serves as a refuge for air congested in the excavation pile hole, which reduces the suction force in the hole generated when the auger is removed from the rod and prevents the collapse of the hole peripheral wall due to the suction force. It also has the function and effect.

Further, according to the present invention, the arrangement of the excavation stirrer I, the turbulent crusher II, and the presser III is adjusted in accordance with the conditions of the ground such as softness of the construction ground. By changing, arranging, and adding, there is an economic effect that the apparatus can be immediately adapted to the ground layer without the necessity of changing the entire apparatus every time depending on the ground conditions.

[Brief description of the drawings]

FIG. 1 is an overall view of a foundation ground excavation apparatus according to the present invention,

FIG. 2 is a view showing an example of a link according to another embodiment;

FIG. 3 is an articulated figure according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Auger shaft 2 Cutting edge 3 Screw wing piece 4 Disturbing and crushing rod 5 Intermediate blade 6 Screw wing piece 7 Auger head A Auger rod I Excavation stirring part II Disturbing and crushing part III Compression part

Claims (4)

[Claims] An excavating blade is provided below a tip of an auger shaft as a ground excavating device, and a screw blade piece is provided above the excavating blade.
, A disturbing crushing section II on which a plurality of turbulence and crushing rods 4 are provided above the stirring section I, and further, the entire auger head 7 is formed in a conical shape above the crushing and crushing section II. Each of the auger shafts 1 is formed with a pressing portion III formed by attaching a screw blade piece 6 and an intermediate blade 5 to the conical inclined surface a.
When drilling into the ground, first, a suitable auger rod such as a round or triangular, square, hexagonal or other polygonal shape is formed coaxially on the top of the drilling device. A is connected to a pile driving machine, and the power is driven. When the drilling device is rotated and excavated together with the auger rod A, the excavation and agitating section I excavates and expands the ground below the ground, and the tracing continues. The excavated debris is crushed and disturbed in the disturbing and crushing part II, and the debris which is disintegrated and disturbed is further pitted by the rotating action of the conical slope a of the auger head 7 and the screw blade piece 6 of the subsequent pressing part III. A method of digging a foundation ground, comprising digging a pile hole having a strong hole wall layer in the ground while expanding and tightening the peripheral wall. 2. A drilling stirrer I for attaching a cutting edge 2 below the tip of the auger shaft 1, a screw blade piece 3 above the cutting edge 2, and several disturbances above the stirring part I. A screw having a disturbing crushing section II to which the crushing rod 4 is attached, and further forming the entire auger head 7 in a conical shape above the disturbing crushing section II and forming a pressing soil edge b on the peripheral edge of the conical inclined surface a. A pressure-tightened part III provided with the wing pieces 6 and the intermediate blades 5 is coaxially and integrally disposed, and the rotational trajectory c of the outer peripheral edge of the screw wing pieces 3 and 6 is formed to have substantially the same vertical dimension. Drilling equipment for foundation ground, characterized by the fact that 3. A cut-out portion 3 ｀, 6 ｀ is provided in a part of the upper and lower screw blades 3, 6 or a part of the screw blades of the screw blades 3, 6 on either side. Item 4. The excavation device for foundation ground according to item 1. 4. The excavation stirrer I, the turbulence crusher II, and the compression turret III are changed in the vertical position so that the excavation stirrer I, the turbulence crusher II, and the pressurizer III are adapted to the soft material of the ground. 2. The excavation device for foundation ground according to claim 1, wherein the excavation device is freely connected and arranged.