JP3012064B2 - Steel pipe pile intrusion method and pile driving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for penetrating steel pipe piles used as a foundation for civil engineering and building structures, and a pile driving device.

[0002]

2. Description of the Related Art A plurality of steel pipe piles welded in a line in a longitudinal direction are buried to be used as a foundation for civil engineering and building structures. As a method of burying such a plurality of steel pipe piles, a relatively short steel pipe pile before being welded is penetrated into the ground except for a part, and then the steel pipe pile is laid on the ground surface of the steel pipe pile. There is a method of welding the protruding upper end portion and the lower end portion of a new steel pipe pile, and then penetrating these steel pipe piles into the ground.

[0003] In the ground, there is a stratum having a high N value (index indicating soil strength), that is, a hard soil. In many cases, the formation layer having a high N value is also present in the intermediate layer which is shallower than the support layer. For this reason, in the middle layer having a high N value, it may be difficult to penetrate the steel pipe piles, and it takes a very long time, resulting in an increase in construction cost. Therefore, conventionally, for a formation having such a high N value, 3
Using an earth auger, an auger screw, etc. attached to a separately prepared device such as a point support type pile driver, the auger screw of a separately prepared pile driving device before the penetration of the steel pipe pile or the penetration of the steel pipe pile In this case, a pre-auger method was used in which the intermediate layer was excavated, thereby disturbing the intermediate layer and lowering the N value of the intermediate layer.

[0004]

However, in the above-mentioned conventional method, apart from a pile driving device for penetrating a steel pipe pile,
Two pile driving devices were required to use a pile driving device equipped with August Cruz and the like. In addition, it takes time to move and install the two pile driving devices, so that the construction time is long. Therefore, there is a disadvantage that the construction cost increases.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a steel pipe pile intrusion method capable of penetrating a steel pipe pile even in a stratum having a high N value, and a pile driving device applicable to the method. Is to do.

[0006]

In order to achieve the above object, a method for penetrating a steel pipe pile according to the present invention is a method for penetrating a steel pipe pile in which a plurality of steel pipe piles coaxially welded to each other are rotationally penetrated into soil. , Which is located on the lower side when penetrated into the soil
Penetrating the steel pipe pile, and erecting a rectangular auger slide pipe and setting the lower end of the rectangular auger slide pipe to the first position.
Mounting on the pile driving device body coaxially with the steel pipe pile, and the upper end thereof is vertically movable within the rectangular auger slide pipe and is prevented from rotating by contact with the inner wall of the rectangular auger slide pipe. An auger screw having a rectangular auger generating a rotational force and having an auger head at the lower end is inserted into the rectangular auger slide pipe, and the auger screw is used to insert the first augment in the first steel pipe pile and the first auger. Excavating beyond the lower end of the steel pipe pile, extracting the auger screw and removing the auger slide pipe, and welding the second steel pipe pile to the upper end of the first steel pipe pile coaxially with the first steel pipe pile. And a step of penetrating the plurality of welded steel pipe piles into the soil.

Further, a pile driving device of the present invention applicable to this construction method is a steel pipe pile driving device in which a plurality of steel pipe piles coaxially welded to each other are penetrated into the soil. When the first steel pipe pile located on the lower side
A rectangular auger slide pipe mounted on the pile driving device body coaxially with the steel pipe pile of the above, and the rotation is suppressed by abutment between the rectangular auger slide pipe and the inner wall of the rectangular auger slide pipe. And a rectangular auger attached to the upper end of an auger screw that has an auger head at a lower end and excavates the inside of the first steel pipe pile and applies a rotational force to the auger screw. is there.

[0008]

In the method for penetrating a steel pipe pile according to the present invention, after the first steel pipe pile is penetrated into the soil, the square auger slide pipe is mounted on the pile driving device body penetrating the first steel pipe pile. This mounting is performed on the upper end side of the first steel pipe pile so as to be coaxial with the first steel pipe pile. Next, an auger screw having a rectangular auger mounted on an upper end and an auger head provided on a lower end is inserted into the rectangular auger slide pipe. When excavating with an auger screw, a rotating force acts on the rectangular auger due to the reaction force from the stratum, but since the rectangular auger hits the inner wall of the rectangular auger slide pipe, the rotation of the rectangular auger is suppressed. Co-rotation is prevented.

[0009] The formation that exists in the first steel pipe pile and in a portion beyond the lower end of the first steel pipe pile is excavated by the auger screw. After excavation by the auger screw, the auger screw is withdrawn from the rectangular auger slide pipe, and the rectangular auger slide pipe is removed from the pile driving device body. Next, a second steel pipe pile is welded to the upper end of the first steel pipe pile so as to be coaxial with the first steel pipe pile. Next, these welded steel pipe piles are penetrated into the soil.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings showing embodiments of the present invention. FIG. 1 is an explanatory view showing a pile driving device according to one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view taken along the line II-II, FIG. 3 is an explanatory view showing a method of penetrating a steel pipe pile, FIG. 4 is a partial sectional view showing a state where the lower end of a rectangular auger slide pipe is mounted on a pile driving device body, FIG. 5 is an explanatory view showing a chuck portion of a rotating machine for rotating a steel pipe pile.

As shown in FIG. 1, a pile driving device body 12 of a pile driving device 10 has a rotating machine 1 for rotating a steel pipe pile 14.
6 and a hydraulic cylinder 18 for applying a downward load to the steel pipe pile 14 attached to the rotating machine 16.
A rectangular auger slide pipe 20 is mounted on the upper side of the rotating machine 16, and a rectangular auger 22 and an auger screw 24 are inserted therein. The rectangular auger 22 is for applying a rotational force to the auger screw 24, and an auger head 26 for excavating a stratum is provided at the tip of the auger screw 24.
The rectangular auger slide pipe 20 and the rectangular auger 22 are suspended by a crane 28 with a wire 30.
By removing the bolt 32, the square auger slide pipe 20 and the square auger 22 can be removed from the pile driving device body 12.

As shown in FIG. 2, the rectangular auger slide pipe 20 has a rectangular cross section, and the rectangular auger 22 inserted therein has a rectangular cross section.
For this reason, the rectangular auger 22 tries to rotate due to the reaction force caused by the auger crew 24 excavating the stratum, but since the rectangular auger 22 contacts the inner wall of the rectangular auger slide pipe 20, the rectangular auger 22 Rotation in the rectangular auger slide pipe 20 is suppressed. The cross-sectional shape of the rectangular auger slide pipe 20 and the rectangular auger 22 is not limited to a square, and may be, for example, a hexagon.
Any shape may be used as long as the rotation of the second member is suppressed.

Referring to FIGS. 4 and 5, a state in which the steel pipe pile 14 is mounted on the rotating machine 16 and a state in which the rectangular auger slide pipe 20 is mounted on the rotating machine 16 will be described. The steel pipe pile 14 is detachably attached to a chuck 36 whose diameter is changed by a hydraulic cylinder 34. The rectangular auger slide pipe 20 is fixed to a chuck 36 with bolts 32. This chuck 36
Is rotated in addition to the steel pipe pile when the steel pipe pile 14 is rotationally penetrated into the soil, and the rotation is stopped when the rectangular auger slide pipe 20 is attached.

Next, a method of rotatingly penetrating a plurality of steel pipe piles into the soil will be described with reference to FIG. The left side of FIG. 3 shows the hardness of the formation into which the steel pipe pile penetrates. A formation having a larger N value is a harder formation, and in this embodiment, the lowermost sand layer is a support layer. In the steel pipe pile penetration method of this embodiment,
First, the first steel pipe pile 38 is rotationally penetrated into the soil by the rotating machine 16 and the hydraulic cylinder 18 of the pile driving device main body 12 shown in FIG. In FIG. 3, the pile driving device main body 12 shown in FIG.
Is omitted. In the relatively soft surface layer 40, the clay layer 42, and the sand layer 44, the first steel pipe pile 38 smoothly rotates and penetrates, but in the sand layer 46 having a high N value, the first steel pipe pile 38 becomes difficult to rotate and penetrate. . Therefore, the crane 2 is attached to the pile driving device body 12 (see FIG. 1) into which the first steel pipe pile 38 is rotated and penetrated.
Square auger slide pipe 2 lifted by 8
0 is attached. This mounting is performed on the upper end side of the first steel pipe pile 38 so as to be coaxial with the first steel pipe pile 38. Next, the rectangular auger 22 is mounted on the upper end of the rectangular auger slide pipe 20, and the auger head 26 is mounted on the lower end.
Is inserted by crane 28. Although a rotating force is generated in the rectangular auger 22 by the reaction force generated by the auger crane 24 excavating the stratum, the rectangular auger 22 comes into contact with the inner wall of the rectangular auger slide pipe 20 as shown in FIG. The rotation of the auger 22 in the rectangular auger slide pipe 20 is suppressed. That is, this reaction force is received by the rectangular auger slide pipe 20.

The formation in the first steel pipe pile 38 and the hard formation existing in the portion beyond the lower end of the first steel pipe pile 38 are excavated by the August screw 24. After excavation by the auger screw 24, the auger screw 24 is pulled out of the square auger slide pipe 20 by the crane 28, and the square auger slide pipe 20 is further removed from the pile driving device body 12. Next, the first steel pipe pile 3
8 so as to be coaxial with the first steel pipe pile 38.
Is welded. Next, the plurality of welded steel pipe piles 38 and 40 are rotationally penetrated into the soil by the pile driving device 10.

In the above-described construction method, the August screw 24
Passes through the inside of the first steel pipe pile 38, so that the first steel pipe pile 3
8 serves as a guide, and is dug vertically by the auger screw 24. Moreover, since the diameter of the auger head 26 is smaller than the diameter of the first steel pipe pile 38, the ground around the first steel pipe pile 38 is not disturbed. When the number of steel pipe piles to be penetrated is one, a pre-auger construction method of excavating a stratum before rotating steel pipe piles can be used.

In the above description of the embodiment, the steel pipe pile is rotated. However, the present invention can be applied to a case where a construction method that does not rotate the steel pipe pile is adopted.

[0018]

According to the present invention, a pile driving device provided with a facility for fixing an earth auger is conventionally required. However, as described above, according to the present invention, a square driving device for a steel pipe pile is used. With the auger slide pipe and square auger, 1
It is possible to penetrate steel pipe piles while adopting the auxiliary process of excavating with August crane using a single pile driving device.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a pile driving device according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an explanatory view showing a method of penetrating a steel pipe pile.

FIG. 4 is a partial cross-sectional view showing a state where the lower end of the rectangular auger slide pipe is mounted on the pile driving device body.

FIG. 5 is an explanatory view showing a chuck portion of a rotating machine used for rotating a steel pipe pile.

[Explanation of symbols]

 10: Pile driving device 12: Pile driving device main body 14: Steel pipe pile 20: Square auger slide pipe 22: Square auger 24: August Cru 26: Auger head 38: First steel pipe pile 40: Second steel pipe pile

Continuation of the front page (72) Inventor Shinji Nishizawa 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation Tokyo Head Office (72) Inventor Yoshio Hikasa 740 Akaicho, Chiba-shi, Chiba Prefecture (56) Reference Hei 4-9436 (JP, U) Shokai 57-60932 (JP, U) Heisei 2-125040 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 7 / 00

Claims (2)

(57) [Claims] 1. A method of penetrating a steel pipe pile in which a plurality of steel pipe piles coaxially welded to each other are penetrated into the soil, wherein the first steel pipe pile positioned below when penetrating the soil is penetrated. Erecting a rectangular auger slide pipe, and attaching a lower end of the rectangular auger slide pipe to the pile driving device main body coaxially with the first steel pipe pile; An auger screw that is mounted with a rectangular auger that generates a rotational force and that has an auger head at the lower end and that is movable up and down within a slide pipe and rotation is suppressed by contact with the inner wall of the rectangular auger slide pipe. Into the rectangular auger slide pipe,
Excavating in the first steel pipe pile and the lower end of the first steel pipe pile with the auger screw; removing the auger screw to remove the rectangular auger slide pipe; The second pile is coaxial with the first steel pipe pile at the upper end of the pile.
A step of welding a plurality of welded steel pipe piles, and a step of penetrating the plurality of welded steel pipe piles into soil. 2. A pile driving device for a steel pipe pile, in which a plurality of steel pipe piles coaxially welded to each other are penetrated into the soil, wherein an upper end of the first steel pipe pile positioned below when penetrated into the soil. A square auger slide pipe mounted on the pile driving device body coaxially with the first steel pipe pile on the side of the section, and a vertical auger slide pipe that can move up and down in the square auger slide pipe and an inner wall of the square auger slide pipe. An auger head that is provided with an auger head at a lower end portion that is prevented from rotating by contact and is mounted on an upper end portion of an auger screw that excavates the inside of the first steel pipe pile and applies a rotational force to the auger screw. A pile driving device for steel pipe piles.