JP2575088B2 - Improvement method and equipment of foundation ground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for improving a foundation ground with no noise, such as construction, in which a large-diameter bulb portion is easily and deeply applied to a deep part of the foundation ground to form a strong foundation ground in the ground. The present invention relates to a method for improving a foundation ground whose main purpose is to create a ground, and an apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, among construction methods for constructing a foundation ground such as a building, a ground hole is excavated with a screw auger in the ground, and a foundation pile is excavated by placing a foundation pile in the pile hole. Although a hole device has been developed, a large number of bulb construction methods for forming a large-diameter bulb portion below the pile hole to obtain a strong supporting force have been used in a part thereof. In addition, as shown in FIG. 1, an example of the above-mentioned construction mechanism of the bulb portion is that a part of the auger head is automatically opened in the rotation direction by utilizing the resistance of excavated earth pressure generated during underground excavation. A method of excavating a bulb hole using a so-called expanding blade having an expanding blade mounted thereon has also been developed.

[0003]

However, most of the above-mentioned methods for excavating a bulb hole using an expanding blade are based on the fact that an openable and closable expanding blade is attached to a part of an auger head, especially to an intermediate portion. As shown by the chain line r in FIG. 1, when the foundation pile P is driven, the bulb hole b is formed at the top of the pile hole a, that is, at least at a position above the lowermost end of the pile column where the most supporting force is required. On the other hand, it was found that it was extremely difficult to find an ideally strong supporting force because the lower part of the supporting pile was soft and the supporting pile was soft. Therefore, as a means for creating such a strong supporting force, the above-mentioned rotary expanding blade is attached to the lowermost excavated portion of the auger head, so that the bulb portion b having a large diameter is formed.
Although it is conceivable to construct a digging blade, it is said that it is impossible at all from a mechanical and technical point of view to attach an openable and closable widening blade to the most excavated cutting edge. . In view of the above problems, the present invention makes it extremely easy to dig a large-diameter bulb hole at the lower end of a pile column where the strongest supporting force is required, and improves the entire ground to a solid ground layer In addition to the above, the excavated soil is pressed against the periphery of the excavation hole to create a solid hole wall without fear of collapse, and the excavation method and the device for the foundation ground by noiseless noise with almost no earth removal. It is something to offer.

[0004]

As a means for achieving the above object, a drilling apparatus according to the present invention has a cutting edge 3 attached to the lower end and a screw blade 2 integrally attached to the entire circumference of the head 1. An auger head 1 and an auger casing 5 in which an expanding blade 4 that can be expanded and closed in a horizontal direction by a hydraulic pressure, a mechanical force, or the like to a constant diameter α is attached below the shaft. The auger casing 5 has a shape in which the auger casing 5 is detachably connected to the upper coaxial portion of the auger head 1 having the above-described shape, and has a strong support base in the ground by the excavation method described in the section of operation below. The pile P can be easily and reliably constructed.

[0005]

In the following, an example of drilling a foundation ground by this device will be described. First, the entire device is set on a pile driver, placed on a predetermined ground, and the auger casing 5 and the auger head 1 are set.
Is driven and rotated, and the drilling is performed in the predetermined ground with the leading excavation blade 3, and when a certain depth is reached, the rotary excavation is stopped, the entire apparatus is pulled out to the ground, and the pile a is first drilled in the ground. I do.
Next, the portion of the auger head 1 below the auger casing 5 is separated from the main body casing 5, and only the casing 5 is inserted again to the hole bottom in the pile hole a for excavation. When the auger casing 5 reaches the bottom of the hole, the insertion is stopped, the lower enlarging blade 4 is expanded to a fixed diameter α by hydraulic pressure or mechanical force, and the enlarging blade 4 is horizontally auged. By rotating the casing 5 together with the casing 5, a large-diameter bulb hole b is dug at the bottom of the bottom of the pile hole a. When the drilling of the bulb hole b having the predetermined diameter and the width α is completed at the ground floor, the auger casing 5 is formed.
While the rod is pulled out, a coagulant c such as mortar is inserted into the bulb hole b.
To create mortar columns in the ground. Before the consolidation of the mortar pillars formed in the ground as described above, the core pillars P are inserted into the mortar pillars, so that the large-diameter bulb portion A is integrally formed below the foundation pile P under the ground. It is possible to easily and reliably build a strong foundation pile.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. Reference numeral 1 denotes a head having an appropriate length and an inverted triangular shape, and a tip dug blade 3 having an appropriate shape at a tip portion and an entire shaft. An auger head having screw blades 2 attached to the periphery.
The auger casing 5 has left and right sides or a plurality of enlarged blades 4 mounted on the lower shaft so as to be able to expand and contract in the horizontal direction.
It has a structure that can be detachably connected to the upper part of the auger head 1 via the connecting tool 7 during use. The expanding blade 4 has a structure that can be expanded and closed to a fixed diameter α from the ground by hydraulic pressure, mechanical power, or the like, and is completely accommodated in the casing 5 when the blade is closed. Reference numeral 8 in the drawing denotes an infusion tube for a coagulant such as mortar.

Further, the spiral ridge 6 is integrally provided on the periphery of the auger casing 5, so that the load resistance when the casing 5 rotates is further reduced.

[0008]

As described above, according to the present invention, a pile hole a is excavated by the auger head 1, the auger head 1 is separated from the auger casing 5 at a predetermined depth, and only the auger casing 5 with the enlarged blade 4 is removed. It is inserted into the excavated pile hole a again, the enlarged blade 4 is expanded, and the auger casing 5 is rotated to easily excavate a bulb hole b having a diameter α in the bottom of the pile hole a. Further, by filling the bulb hole b with the coagulating material c such as mortar, the foundation supporting ground in which the large-diameter bulb portion A is integrally formed under the ground, particularly below the foundation pile P, is ensured. Construction can be required. In particular, in the case of the present invention, unlike the related art, the bulb portion A is attached to the lower end portion of the pile post integrally with the pile post without being attached to the middle portion of the pile post. Has a strong and strong foundation supporting force, and has an effect that any geological ground can be easily constructed.

Further, according to the present invention, since the tip auger head 1 and the auger casing 5 are formed so as to be separable, various operations such as transportation and storage are extremely easy. Since the auger casing 5 is inserted into the pile hole a which can be excavated earlier at 1, the auger casing 5 can be inserted very easily without any resistance, and of course, the enlarged excavation by the expanding blade 4 is the deepest in the hole. Since it is carried out at the section, the noise generated by the excavation is not transmitted to the ground, and the construction has various advantages such as very quiet construction.

Further, the spiral ridge 6 is formed integrally with the periphery of the auger casing 5 as described in claim 3, so that the spiral ridge 6 works with the hole wall at the time of underground excavation due to the action of the spiral ridge 6. The effect is that the frictional resistance is cut off, a smooth excavation work is obtained, and the amount of earth removal on the ground is extremely small.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a conventional ground excavation method using an enlarged blade,

FIG. 2,,,,, and are construction diagrams of the ground excavation method of the present invention,

[Fig. 3]

FIG. 4 is a front view of a ground excavation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Auger head 2 Screw blade 3 Cutting edge 4 Enlarged blade 5 Auger casing 6 Spiral ridge 7 Connector 8 Mortar infusion tube

Claims (3)

(57) [Claims] 1. An auger head 1 provided with a cutting edge 3 at a lower end portion and a screw blade 2 on the entire circumference,
A ground excavation device integrally connecting an auger casing 5 in which a plurality of enlarged blades 4 are mounted so as to expand and contract in the horizontal direction so as to be freely expandable and contractible is set on a pile driving machine, and the predetermined power is turned by rotation of the power. When the ground is dug and reaches a certain depth, first, the entire device is withdrawn to the ground and a pile hole a is dug underground.
The lower part of the auger head 1 is separated from the main casing 5 and only the casing 5 is inserted again to the bottom of the excavated pile hole a, and then the lower enlarged blade 4 is expanded. By rotating, a large-diameter bulb hole b is excavated at the bottom bottom of the pile hole a, and a coagulant c such as mortar is injected and filled into the bulb hole b to insert the pile column P to thereby perform the underground bottom. A method of improving the foundation ground, characterized in that a solid foundation pile having a large diameter is to be constructed. 2. An auger head 1 having a cutting edge 3 attached to a lower end thereof and a screw blade 2 integrally attached to the entire circumference of the head 1, and a fixed diameter width in a horizontal direction by hydraulic pressure or mechanical force. is formed by an auger casing 5 in which an expandable blade 4 that can be expanded and closed at α is attached below the shaft.
An excavating apparatus for foundation ground, wherein the auger casing 5 is detachably connected to the upper coaxial portion of the auger head 1 having the above-mentioned shape. 3. The drilling device for a foundation ground according to claim 2, wherein a spiral ridge 6 is formed on a peripheral portion of the auger casing 5.
A digging device for foundation ground, wherein a pit is integrally formed.