JPH05247923A - Ground improving equipment - Google Patents

Abstract

PURPOSE:To execute work on a resisting hole strong for ground and enable the hole to be excavated almost with non-sludge withdrawal, by fitting an excavating blade at the tip of an auger head, to set a stirring blade on the upper section and to form a slender conic upper-surface, and by forming a strip or the plural strips of spiral channel in the non-rotational direction. CONSTITUTION:An auger is rotated, and a tip excavating-blade 2 is rotated, and they are advanced to be excavated to a specified depth. In this case, a conical earth pressing surface 4 with the same axis as that of the excavating blade 2 is worked, and a hole peripheral-surface is slowly pressed and a column hole is set to be bored. Besides, the internal section of a spiral channel 5 set on the conical earth pressing surface 4 is formed in the shape of a defamed triangle with an acute angle surface and a gently oblique surface, and by the rotation of the acute angle surface, the hole periphery is chipped to be widened, and at the same time, by the rotation of the one-side gently oblique surface, chipped earth is tamped, and a hole wall without destruction is formed. As a result, almost without a sludge with-drawal onto a ground level, the strong column hole can be excavated easily and firmly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement device whose main purpose is to construct a strong and optimum ground layer in a ground such as a building by an almost soil-free and vibration-free construction method.

[0002]

2. Description of the Related Art Construction devices of various shapes have been developed as conventional ground improvement devices, but these mechanisms merely excavate pile holes for driving foundation piles in the ground, for example, at the head tip. It is composed of an excavating blade for excavating the underground and a screw blade for excavating the excavated soil on the ground.

However, since most of the construction devices of this type excavate the ground by rotating the tip excavation blade, as described above, the excavation blade disturbs the ground, of course, and especially During excavation work, the peripheral wall of the hole collapsed, which fell into the hole and caused serious obstacles to the subsequent work.
In addition, there are various drawbacks such as excavating the excavated soil by the action of the screw blades and accumulating the excavated soil on the ground, which requires a considerable amount of labor and cost for the work such as the soil disposal treatment.

In order to solve such a drawback, the present inventor has previously shown the excavation device shown in FIG. 1 (Japanese Patent Application No. 3-3818).
9), that is, in the auger head A having the cutting blade B and the disturbing blade C at the tip, the conical shaped soil surface D is formed on the upper portion of the disturbing blade C and the longitudinally crossing the compressed soil surface D. We have developed a device that is provided with a concave groove E having a substantially triangular shape. The device temporarily fills the excavated earth and sand in the recessed groove E during the underground excavation,
With the rotation of the head, the retained earth and sand are gradually extruded in the outer peripheral direction, and the ironing action of the concave groove surface presses the hole circumference to construct a strong pile hole around the hole. In comparison with the conventional method of simply consolidating the hole circumferential surface, the hole wall is pressed more firmly and securely to dig into the ground, and the soil around the hole collapses during the drilling operation. It is a convenient non-burning earth digging device that does not have any concern about the above and that there is almost no discharge to the ground.

In the case of such a device, on the other hand, while having the above-mentioned advantages, excavated earth and sand are temporarily stored in the recessed groove E having a vertical cross section and a substantially triangular cross section, and this is accompanied by the rotation of the head. It was found that since the sand and sand are pushed out and pressed in the outer peripheral direction, a strong pressing can be obtained, but a considerable resistance is generated at the time of rotation and a large amount of energy is burdened.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and it is possible to reduce the resistance of any soft-hard ground layer and to make a pile strong on a predetermined ground with very little energy. Its main purpose is to provide a ground improvement device capable of reliably and easily constructing a hole and enabling drilling with almost no soil.

[0007]

As a means for attaining the above-mentioned object, the ground improvement apparatus according to the present invention is provided with a dug blade 2 having an appropriate shape at the tip of an auger head 1 and a number above the dug blade 2. The disturbing blade 3 is attached and the disturbing blade 3 is attached.
A slender conical soil surface 4 of a certain length is formed on the upper part of the slender conical soil surface 4, and a deformed triangular spiral groove 5 having an acute-angled surface c and a gently sloping surface b is formed in the concave groove on the slender conical soil surface 4. It features a structure attached to the non-rotating direction.

[0008]

Next, the construction example of the device will be described. First, the device is set on a pile driver and placed on a predetermined ground, and then the auger is driven and rotated to rotate the tip excavation blade 2 to a predetermined depth. Dig up to. At the same time as the above-mentioned excavation, the elongated conical shaped soil surface 4 coaxial with the excavating blade 2 is used to gradually press the circumferential surface of the hole to form a pillar hole of a predetermined length in the ground. At the time of excavation, the slanted conical soil surface 4 is attached in a non-rotational direction to the inclined spiral groove 5, that is, the rotation action of the acute-angled surface c cuts and expands the circumference of the hole, and at the same time, the cutting sand is gently inclined to one By rotating the surface b, the peripheral wall of the hole is firmly clamped while expanding and compressing to the periphery of the hole, and a strong hole wall without collapse can be easily and surely obtained.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an auger head formed by forming an overall shape into a substantially vertically long conical shape.
Install. Further, just above the excavating blade 2, several disturbing blades 3 having a blade length approximately the same as the diameter a of the auger head 1 are arranged at appropriate intervals to excavate during excavation. It also has the function of stirring and kneading mortar milk that can be added at the same time that soil is disturbed. An elongated conical shaped soil surface 4 having a gentle inclination angle is formed on the upper part of the disturbing blade 3 due to the geological condition of the excavation, and an inclined shape with respect to the non-rotating direction is formed at an appropriate place such as the upper portion of the soil surface 4. The spiral groove 5 is provided with one or several recesses.

As shown in FIG. 3, the spiral groove 5 is formed into a substantially triangular shape having a gentle inclined surface b on the inner surface of the concave groove with respect to the rotation direction and an acute angle surface c with respect to the non-rotational direction. ing. Although not shown in the figure, the auger head 1 has a structure in which a cement milk injection hole and a cement milk feed pipe are attached to the tip, and a tip drilling blade 2 and a drilling blade 3 are provided. It is also possible to detachably connect the distal end head below the elongated conical shaped soil portion without being integrated with the auger head 1.

[0011]

According to the present invention, the elongated conical shaped soil surface 4 is formed on the upper part of the auger head 1 having the tip cutting blade 2 and the disturbance blade 3 as described above, and the soil surface 4 is not formed. Since the spiral groove 5 is additionally formed in the direction of rotation, it has the smallest resistance during excavation compared to the previously developed recessed groove E having a generally triangular cross section with a vertical split. It is possible to more firmly and securely compress the hole circumference and to easily and reliably dig a strong pile hole in the ground. That is, according to the present invention, the gentle sloped surface b and the acute angled surface c in the spiral groove 5 during the above-described excavation.
Since the hole wall is surely cut by the action of the reverse spiral due to and at the same time the cutting sand is naturally released in the outer peripheral direction, the sloping surface b acts to squeeze it, so that the conventional pressure is applied. Unlike the soil device, there is almost no strong resistance load generated during excavation, so that the hole circumference can be clamped more firmly and reliably. Furthermore, since the hole wall is pressed at the same time as the excavation, there is no concern that the hole circumference will collapse during the work, and the excavated earth and sand is reliably pressed to the hole circumference, and the amount of soil discharged to the ground is also high. It can be said to be a great invention not only for waste disposal work, but also for economical reasons, such as the fact that frictional resistance during excavation is small and energy used can be greatly saved.

[Brief description of drawings]

FIG. 1 is a front view of a previously developed ground improvement device excavation device,

FIG. 2 is a front view of the ground improvement device according to the present invention.

[Fig. 3] Same as above, right side view

FIG. 4 is a transverse cross section of a main part of the same.

[Explanation of symbols]

 3 Disturbing blade 4 Slender conical compacted soil surface 5 Helical groove

Claims (2)

[Claims] 1. An auger head having an appropriately shaped excavating blade attached to the tip of the auger head, several disturbing blades attached to the upper portion of the excavating blade, and an elongated conical shaped soil surface of a constant length above the disturbing blade. And a spiral groove having a cutting and soil portion on the elongated conical soil surface is provided with one or several lines in the non-rotational direction. 2. The concave portion of the inner surface on the upper part of the elongated conical compacted soil surface according to claim 1 is formed as a gently inclined surface b with respect to the rotating direction and an acute angle surface c with respect to the non-rotating direction. A ground improvement device having a substantially deformed triangular spiral groove 5 formed therein.