KR20210095394A - Helix pile and construction method thereof - Google Patents

Abstract

The present invention relates to a helix pile having improved drivability and a construction method thereof and, more specifically, to a helix pile having improved drivability, which includes a helix formed at the tip of a pile body, has a screw continuously formed on an upper part of the helix to have a size smaller than that of the helix, and allows the screw to push up soil upwardly to reduce tip resistance, thereby increasing drivability, and a construction method thereof. According to a preferred embodiment of the present invention, a helix pile having improved drivability comprises: a pile body formed as a shaft member having a predetermined length and having a hollow; a helix having the shape of a spiral blade and formed on the outer surface of a lower end of the pile body; and a screw formed as a continuous spiral blade having a size smaller than that of the helix, and continuously spirally formed on the outer peripheral surface of the pile body from an upper part of the helix to a predetermined height.

Description

Helix pile with excellent penetrability and its construction method {HELIX PILE AND CONSTRUCTION METHOD THEREOF}

The present invention relates to a helix pile having excellent penetrability and a construction method thereof, and more particularly, a helix is formed at the tip of the pile body, and a screw is continuously formed on the top of the helix with a size smaller than the size of the helix. The present invention relates to a helix pile with excellent penetrability, which allows the upper screw to push up the soil to the upper part when discharging soil from a furnace, thereby improving penetration with low tip resistance, and a construction method thereof.

There are various types of piles installed on soft ground depending on the shape and use, but in particular, in a narrow area where large excavation equipment cannot be used, a small-scale drilling facility is used to form a drilling hole of a predetermined depth up to the support layer, and then a hollow wall protection casing, etc. A micropile is used to form small-diameter cast-in-place piles by installing and grouting the inside at low pressure. Helix files are used to reinforce them.

As a background technology of the present invention, there is Patent Registration No. 1636250 "Helical Pile" (Patent Document 1). In the background art, 'shaft part having one end sharply formed and a rotation shaft formed along the longitudinal direction to the other end; It protrudes helically in the longitudinal direction and vertical direction adjacent to one end of the shaft part, and when the shaft part is inserted into the ground and rotates, supporting the shaft part in the underground in the direction opposite to the insertion direction or the insertion direction of the shaft part a first helix unit; It is provided to be spaced apart from the first helix part on the other side of the shaft part, is disposed to partially surround the outer circumferential surface of the shaft part, and the first helix part supports the shaft part in the underground in a direction perpendicular to the direction in which the shaft is underground. Includes a cylindrical portion for supporting and a coupling portion interposed between the cylindrical portion and the shaft portion to fix the cylindrical portion on the shaft portion, wherein the coupling portion includes a first support member connecting the shaft portion and the cylindrical portion; and a second support member provided between the shaft part and the first support member so as to increase a fixing force between the first support member and the shaft part, wherein the first support member is configured such that the coupling part is inserted into the shaft part. We propose a 'helical pile, characterized in that it includes a plurality of through holes formed at equal intervals to reduce the pressure generated in the ground while transporting in the direction opposite to the direction or the insertion direction.

However, the background art has a problem in that the tip resistance is large and the penetrability is poor.

Patent Registration No. 1636250 "Helical Pile"

The present invention is to solve the above problems, and it is an object of the present invention to provide a helix pile excellent in penetrability and a construction method thereof, which can improve penetrability by lowering the tip resistance while using a helix in the form of a spiral blade. .

The present invention is a pile body made of a shaft member of a certain length is formed hollow; Helix in the form of a spiral blade formed on the outer surface of the lower end of the pile body; Helix with excellent penetrability, characterized in that it comprises a continuous spiral blade of a predetermined size smaller than the size of the helix and continuously spirally formed on the outer peripheral surface from the top of the helix of the pile body to a predetermined height. I would like to provide a file.

In addition, it is an object of the present invention to provide a helix file with excellent penetrability, characterized in that a tip bit is configured under the helix.

In addition, it is an object of the present invention to provide a helix pile having excellent penetrability, characterized in that a shaft pile of a certain length is fastened to the upper portion of the pile body by a coupler.

In addition, a fastening hole is formed through the upper portion of the pile body at a predetermined height, and the coupler is formed in a tubular shape having an inner diameter corresponding to the outer diameter of the pile body, and a through hole is formed in the lower portion by penetrating at a predetermined height, the upper portion of the shaft pile Excellent penetration, characterized in that the lower part of the coupler is inserted into the upper part of the file body and the bolt penetrates the through hole of the shaft file and the fastening hole of the file body to combine the shaft file and the body file. We would like to provide a helix file.

In addition, (a) penetrating the file body; (b) connecting the shaft pile to the upper part of the pile body with a coupler; (c) rotating the shaft pile coupled to the pile body and grouting at the same time as penetration; (d) arranging the head of the shaft pile; to provide a construction method of a helix pile excellent in penetration, characterized in that it comprises a.

In addition, in step (c), the grout material has a tip section (a) W/C ratio of 60-90%, a middle section (b) W/C ratio of 60-70%, and a head section (c) W/C ratio intends to provide a construction method of a helix pile with excellent penetrability, characterized by grouting in the range of 40-50%.

In addition, (d) after the step, (e) installing a pressure plate at the upper end of the shaft pile; (f) pouring the foundation concrete into the upper part of the acupressure plate and burying the upper part of the shaft pile and the acupressure plate at the same time;

The helix pile excellent in penetration and its construction method of the present invention constitute a helix in the form of a spiral wing at the tip of the pile body, and a screw with a size smaller than the size of the helix is continuously formed up to a certain height at the top of the helix. When discharging soil with the tip helix, the screw on the top pushes the soil upward, so the tip resistance is small, so it is very useful to improve penetration.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the present invention, so the present invention is limited to the matters described in the accompanying drawings It should not be construed as being limited.
1 is a front view showing the configuration of a helix pile excellent in penetration of the present invention.
FIG. 2 is a diagram illustrating another embodiment of FIG. 1 .
3 is a bottom view of FIG. 2 .
4 is an exploded view of the coupling part of FIG. 2 and a cross-sectional view of the coupling state.
5 is a view sequentially showing the construction method of the helix pile excellent in penetration of the present invention.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the presented embodiments are illustrative for a clear understanding of the present invention, and the present invention is not limited thereto.

Hereinafter, the technical configuration of the present invention will be described in detail according to a preferred embodiment.

1 is a front view showing the configuration of a helix pile excellent in penetration of the present invention.

As shown in FIG. 1, the helix pile of the present invention has a pile body 10 made of a shaft member of a certain length having a hollow, and a helix 20 in the form of a spiral blade formed on the outer surface of the lower end of the pile body 10. and a screw 30 continuously spirally formed on the outer peripheral surface from the upper portion of the helix 20 to a predetermined height.

The pile body 10 has a hollow tubular shape like a general pipe. The pile body 10 in the present invention is a pile widely used in civil engineering and construction fields, and the lower end is formed in a conical shape as shown so that the ground can be dug smoothly. In addition, the other end of the pile body 10 is mounted on a pile driver mounted on an excavator, and accordingly, the pile body 10 penetrates the ground by rotating during operation of the pile driver.

The helix 20 in the form of a spiral wing is configured on the outer surface of the lower end of the pile body 10 as described above. The size and inclination angle of the helix 20 on a plane may be variously applied according to the condition of the ground.

As such, the helix 20 is configured at the tip of the pile body 10 , and the screw 30 is configured in a predetermined section of the pile body 10 above the helix 20 .

As shown, the screw 30 is made of a predetermined size smaller than the planar size of the helix 20, and continuously in a predetermined section of the pile body 10 from the top of the helix 20 with continuous spiral blades. is formed

As such, in the present invention, a helix 20 in the form of a spiral wing is formed at the tip of the pile body 10, and the upper portion of the pile body 10 is smaller than the size of the helix 20 at the top of the helix 20. The screw 30 is continuously formed up to a certain height so that the screw 30 at the top pushes the soil upward when the soil is discharged with the tip helix 20 when penetrating the ground, so that the tip resistance is small and the penetration is improved to be able to do it

FIG. 2 is a view showing another embodiment of FIG. 1 , FIG. 3 is a bottom view of FIG. 2 , and FIG. 4 is an exploded view of the coupling part of FIG. 2 and a cross-sectional view of the coupling state.

In addition, as in FIG. 2 , the tip bit 40 may be configured under the helix 30 .

In general, in the case of a helix pile, penetration in the gravel layer is not easy, but in this way, by configuring the tip bit 40 in the lower part of the helix 30, penetration of the gravel layer is possible, and if there is no gravel layer, the tip bit 40 is used. It is very efficient because it is possible to omit the configuration.

The tip bit 40 may be formed in a triangular shape as shown, and in addition, various known bits may be used.

In particular, the pile body 10 may have a shaft pile 60 of a certain length to be fastened to the upper portion of the pile body 10 by a coupler 70 .

At this time, the coupler 70 is formed in a cylindrical shape with an empty interior so that a portion of the upper portion is inserted into the lower end of the shaft pile 60 and joined by a method such as welding, and a portion of the lower portion is of the pile body 10 . It can be inserted into the upper end and fastened with the bolt 80 .

To this end, a fastening hole 11 is formed through the upper portion of the pile body 10 at a certain height, and the coupler 70 is formed in a tubular shape having an inner diameter corresponding to the outer diameter of the pile body 10 and the lower portion At each predetermined height, a through hole 71 is formed by penetrating at a position corresponding to the fastening hole 11, and the lower end of the shaft pile 60 is fitted and joined to the upper portion of the coupler 70, and the coupler 70 of The upper end of the pile body 10 is inserted into the lower part to match the through hole 71 of the shaft pile 60 and the fastening hole 11 of the pile body 10, and then the bolt 80 passes through the shaft pile 60 The ball 71 and the fastening hole 11 of the pile body 10 may penetrate through the shaft pile 60 and the body pile 10 to be coupled.

The coupler 70 is inserted into the upper end of the pile body 10 and the bolt 80 penetrates the coupler 70 and the body pile 10 to be fastened to be in close contact, so that shaking due to bolt clearance like the existing pile is reduced. There is no problem of bolt loosening during penetration.

5 is a view sequentially showing the construction method of the helix pile excellent in penetration of the present invention.

The construction method of the helix pile excellent in penetration of the present invention, as shown in Figure 5a, first, the pile body 10 to penetrate the ground (a).

As a step in which the pile body 10 is rotationally penetrated, the pile body 10 having the helix 20 and the screw 30 installed therein is mounted on a pile driver to rotate and penetrate the ground.

Thereafter, as shown in FIG. 5b , the shaft pile 60 is connected to the upper portion of the pile body 10 by a coupler 70 (b).

Thereafter, as in FIG. 5c , the shaft pile 60 coupled to the pile body 10 is rotated to perform grouting at the same time as penetration (c).

Specifically, the shaft pile 60 is rotated into the ground and grout is injected and grouted at the same time to prevent corrosion of the outside of the pile body 10, and the direct compression force of the pile body 10 is reinforced.

In particular, the grout material has a W/C ratio of 60-90% in the tip section (a), 60-70% in the middle section (b), and a W/C ratio of 40-50% in the head section (c). You can make it grout with a range.

The tip section (a) W/C (water-cement) ratio is 60~90% to reduce the tip resistance to improve the rotational penetration.

If the W/C (water-cement) ratio is less than 60%, the tip resistance increases, and if it exceeds 90%, the compression force is not reinforced. is preferably 60 to 90%.

In the middle section (b), the W/C ratio can be set to 60 to 70% so that grouting can be performed. When the W/C ratio is less than 60%, gravitational grouting does not occur, and when it is configured in excess of 70%, the strength may be weakened, so the W/C ratio in the middle section (b) is preferably 60 to 70%.

Head section (c) W/C ratio can be sub-mixed in the range of 40-50% to resist large frictional force on the main surface and horizontal support force.

In particular, the grout material may be made to increase the frictional force of the main surface by adding an expanding agent, a crude steel material, etc. to make the ground into soil cement.

Then, to arrange the head of the shaft file (60) (d).

After the pile body 10 and the shaft pile 60 are completely rotatably penetrated into the ground, the upper part of the shaft pile 60 is cut to arrange the head.

After step (d), as in FIG. 5d, the acupressure plate 90 is installed at the upper end of the shaft pile 60 (e), and as in FIG. 5e, the foundation concrete is poured into the upper part of the acupressure plate 90 to the shaft The step (f) of burying the upper part of the pile 60 and the acupressure plate 90 at the same time may be further included.

The acupressure plate 90 is installed in the cut part of the upper part of the shaft pile 60 after the pile body 10 and the shaft pile 60 are completely rotatably penetrated into the ground.

After installing the acupressure plate 90 on the upper end of the shaft pile 60, reinforcing reinforcing bars, etc. are performed to perform the foundation construction for pouring the foundation concrete 100, and extension construction may be performed if necessary.

As described above, the helix pile excellent in penetration and its construction method of the present invention comprises a helix in the form of a helical wing at the tip of the pile body, and a screw with a size smaller than the size of the helix on the top of the helix continuously up to a certain height of the upper part. It has a very useful effect in that the tip resistance is small and penetration is improved by allowing the screw on the top to push up the soil to the top when the soil is discharged by the tip helix.

So far, the present invention has been described in detail with reference to the presented embodiments, but those skilled in the art can make various modifications and modified inventions without departing from the technical spirit of the present invention with reference to the presented embodiments. will be. The present invention is not limited by such variations and modifications, but only by the claims appended hereto.

10: file body
11: fastener
20: Helix
30: screw
40: tip bit
60: shaft pile
70: coupler
71: through hole
80: volt
90: acupressure plate
100: foundation concrete

Claims (7)

A pile body 10 made of a shaft member of a certain length in which a hollow is formed;
Helix 20 in the form of a spiral wing formed on the outer surface of the lower end of the pile body 10;
The screw 30 is formed as a continuous helical blade of a size smaller than the size of the helix 20 and is continuously helically formed on the outer peripheral surface from the upper part of the helix 20 of the pile body 10 to a predetermined height; Helix file with excellent penetrability, characterized in that it includes. The method according to claim 1,
Helix file with excellent penetration, characterized in that the tip bit 40 is configured in the lower portion of the helix 30. The method according to claim 1,
A helix pile with excellent penetration, characterized in that the shaft pile 60 of a certain length is fastened to the upper part of the pile body 10 by a coupler 70. 4. The method according to claim 3,
A fastening hole 11 is formed in the upper portion of the pile body 10 through a predetermined height,
The coupler 70 is made of a tubular shape having an inner diameter corresponding to the outer diameter of the pile body 10 and a through hole 71 is formed through the lower portion at a predetermined height, and the upper portion is inserted into the lower end of the shaft pile 60 joined,
The lower part of the coupler 70 is inserted into the upper end of the pile body 10 so that the bolt 80 passes through the through hole 71 of the shaft pile 60 and the fastening hole 11 of the pile body 10 to the shaft pile ( 60) and the helix pile excellent in penetration, characterized in that to combine the body pile (10). In the construction method using the helix pile of any one of claims 1 to 4,
(a) penetrating the file body 10;
(b) connecting the shaft pile 60 to the upper portion of the pile body 10 with a coupler 70;
(c) rotating the shaft pile (60) coupled to the pile body (10) and grouting at the same time as penetration;
(d) arranging the head of the shaft pile (60); construction method of a helix pile excellent in penetration, characterized in that it comprises a. 6. The method of claim 5,
(c) in step,
For grout material, the W/C ratio for the tip section (a) is 60~90%, the W/C ratio for the middle section (b) is 60~70%, and the W/C ratio for the head section (c) is 40~50%. A method of constructing a helix pile with excellent penetration, characterized by grouting. 6. The method of claim 5,
(d) after step,
(e) installing a pressure plate 90 on the upper end of the shaft pile (60);
(f) pouring the foundation concrete 100 into the upper part of the acupressure plate 90 and simultaneously burying the upper part of the shaft pile 60 and the acupressure plate 90; construction method.

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