Biaxial coaxial auger conversion pile extraction device

Abstract

To provide a pile extraction device which relieves diameter difference in a connection portion of an auger and a pile extraction casing and which prevents deformation and breakage of a connection portion.SOLUTION: A pedestal is provided in a hollow portion on a revolving shaft of an outside auger of a separate type two-shaft coaxial type auger, a swivel device is mounted, and a pile extraction casing and an outside auger output shaft of the separate type two-shaft coaxial type auger are joined via a casing coupling in a lower part of a drum flange. A swivel device for an outside output shaft is connected to water piping from a swivel device for an inside output shaft of a two-shaft coaxial type auger, to make water piping for an outside output shaft. The pile extraction casing and the outside output shaft of the two-shaft coaxial type auger are joined via the casing coupling in the lower part of the drum flange.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a device for extracting existing piles driven into the ground. [Background technology]

[0002] A conventional method for extracting an existing pile involves rotating a pile extraction casing, which has a bit and a water pipe attached to the tip, around the existing pile while discharging water, pulling it out and cutting the friction between the existing pile and the ground, and then using a crane to pull out the pile extraction casing (see Patent Document 1).

[0003] However, in conventional technology, earth augers have a shaft coupling protruding from the output shaft that transmits rotational force and propulsive force to the drilling screw and casing, but the inner diameter of the pile extraction casing is generally larger than the outer diameter of the existing pile to be extracted, and there is a large difference between the outer diameter of the hexagonal column-shaped shaft coupling and the outer diameter of the pile extraction casing.As a result, when a bending load from the pile extraction casing is applied to the connection between the hexagonal column-shaped shaft coupling and the pile extraction casing, the bending stress is concentrated in the shaft coupling, resulting in deformation or damage to the shaft coupling.

[0004] Therefore, we thought that if the outer auger of a separate twin-shaft coaxial auger, which is a type of twin-shaft coaxial auger with a removable inner auger, could be converted into a pile extraction device, the difference in outer diameter of the connection part with the pile extraction casing could be alleviated. However, direct conversion was not possible because it does not have a swivel device for sending water to the pile extraction casing.

[0005] In addition, it was thought that if the outer output shaft of the twin-shaft coaxial auger, whose output shaft diameter is larger than that of the earth auger, could be converted into a pile extraction device, the difference in the outer diameter of the connection part with the pile extraction casing could be alleviated. However, when using the outer output shaft, the swivel device for sending water to the pile extraction casing was for the inner output shaft, which meant that it could not be converted as it was. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2002-188146 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention solves these problems and aims to repurpose the outer auger and the biaxial auger of a separate type biaxial auger, which is a type of biaxial auger, as an existing pile extraction device. [Means for solving the problem]

[0008] As a means for solving the above problem, the present invention (1) teeth, (A) A separate type biaxial coaxial auger has an inner auger and an outer auger, and the inner auger is detachable from the separate type biaxial coaxial auger, and the outer auger is used as a rotation drive unit. (b) A casing for pulling out piles is connected to the outer output shaft of the outer auger via a drum flange and a casing coupling, instead of a casing for the outer auger. (c) A swivel device is attached to a hollow portion on the rotation shaft of the outer auger via a pedestal, and a water pipe is arranged from the swivel device through the outside of the pile extraction casing to the tip of the pile extraction casing. Consists of (a), (b), and (c). That Abstract Let us assume that.

[0009] Also, The present invention (2) is (D) An integrated twin-shaft coaxial auger having an inner auger and an outer auger, in which the inner auger cannot be removed, is used as a rotary drive unit by removing or not attaching an inner screw to the inner auger. (e) A casing for pulling out piles is connected to the outer output shaft of the outer auger via a drum flange and a casing coupling, instead of a casing for the outer auger. (F) A swivel device is installed in the outer output shaft of the outer auger to convert water piping from the water piping of the existing swivel device on the inner output shaft of the inner auger to water piping for the outer output shaft, and water piping is arranged in a line from the swivel device in the outer output shaft through the outside of the pile extraction casing to the tip of the pile extraction casing. Consists of (ni), (ho), and (he), That Abstract Let us assume that. Effect of the Invention

[0010] The present invention (1) According to the report, the separate twin-shaft coaxial auger Outer auger Outer Output Shaft Diameter teeth Conventional of Earth auger output shaft diameter Larger than the pile The outer diameter of the connection part with the casing can be made large up to the maximum outer shaft diameter. ,outside Ogre Outside The difference in outer diameter between the output shaft and the pile casing is reduced. thisDeformation and damage to the connection parts can be prevented. According to the present invention (2), the outer output shaft diameter of the outer auger of the integrated twin-shaft coaxial auger is larger than the output shaft diameter of a conventional earth auger, and the outer diameter of the connection part with the pile extraction casing can be made large up to the maximum outer shaft diameter. This reduces the difference in outer diameter of the connection part between the outer output shaft of the outer auger and the pile extraction casing, thereby preventing deformation or damage to this connection part.

[0011] [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a side view of a separate type twin-shaft coaxial auger. [Diagram 2] FIG. 1 is a side view showing an embodiment of the present invention when converted into a separate twin-shaft coaxial auger. [Diagram 3] FIG. 1 is a top view showing an embodiment of a base for mounting a swivel device when converting a separate twin-shaft coaxial auger according to the present invention. [Figure 4] FIG. 2 is a side view showing an embodiment of the present invention when a twin-shaft coaxial auger is converted. [Diagram 5] FIG. 1 is a side view of a conventional pile extraction device using an earth auger. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present invention will be described below with reference to the embodiment shown in the drawings. Figures 2 and 3 show an example of conversion of a separate type coaxial twin-shaft auger, which is a type of coaxial twin-shaft auger. The separate type coaxial twin-shaft auger 1 is used with the inner auger removed, and the outer output shaft 9 of the outer auger 3 and the pile puller casing 2 are joined via a casing coupling 13 at the bottom of the drum flange 4. The upper side of the drum flange 4 is adapted to the outer output shaft diameter of the outer auger 3, and the lower side of the drum flange 4 is adapted to the flange outer diameter of the casing coupling 13. The water piping 6 is provided on a base 8 on the upper part of the outer auger 3, and is arranged in a line from there through the drum flange 4, passing outside the pile puller casing 2 to the tip of the pile puller casing 2. The water piping 6 may be arranged to the pile puller casing 2 without passing through the drum flange 4.

[0014] FIG. 4 shows an example of conversion to a twin-shaft coaxial auger, in which the outer output shaft 9 of the twin-shaft coaxial auger 7 and the pile extracting casing 2 are joined via a casing coupling 13 at the bottom of the drum flange 4, and the upper side of the drum flange 4 is adjusted to the outer diameter of the outer output shaft of the twin-shaft coaxial auger 7, and the lower side of the drum flange 4 is adjusted to the outer flange diameter of the casing coupling 13. Inside the outer output shaft 9, a swivel device 5b is installed to convert the water piping of the swivel device 5a for the inner rotating shaft of the twin-shaft coaxial auger 7 to that for the outer rotating shaft. The water piping 6 is arranged in a line from this swivel device 5b through the drum flange 4, passing around the outside of the pile extracting casing 2 to the tip of the pile extracting casing 2. The water piping 6 may be arranged to the pile extracting casing 2 without passing through the drum flange 4.

[0015] Figure 4 is a side view of a conventional pile extraction device using an earth auger, in which the output shaft 12 of the earth auger 11 and the pile extraction casing 2 are connected via a shaft coupling 10, and a water pipe 6 is connected from a swivel device 5 on the earth auger 11 side to the pile extraction casing 2, so that the periphery of an existing pile (not shown) can be excavated. The diameter of this connection is smaller than the diameter of the pile extraction casing, which leads to deformation and damage to the connection. EXAMPLES

[0016] Next, the operation of the above embodiment will be described with reference to FIGS.

[0017] In the case of claim 1, a casing auger is installed on the existing pile (not shown) to be extracted, in which the outer output shaft 9 and the pile extracting casing 2 are joined via the casing coupling 13 at the bottom of the drum flange 4 to the outer auger 8 of the separate type twin-shaft coaxial auger 1 from which the inner auger has been removed. The upper side of the drum flange 4 is adjusted to the outer output shaft diameter of the outer auger 3, and the lower side of the drum flange 4 is adjusted to the flange outer diameter of the casing coupling 13. The water piping 6 is arranged in a line from the swivel device 5 on the base 8 provided on the upper part of the outer auger 3 through the drum flange 4, passing outside the pile extracting casing 2 to the tip of the pile extracting casing 2. The water piping 6 may be arranged to the pile extracting casing 2 without passing through the drum flange 4. The outer auger 3 of the separate type twin-shaft coaxial auger 1 is driven while supplying and discharging water, and rotary excavation is performed.

[0018] Next, when the excavation is completed to a depth deeper than the length of the existing pile, the drive of the separate twin-shaft coaxial auger 1 and the water supply are stopped. At this time, because water is being supplied to the tip of the pile extracting casing 2 from the outside of the pile extracting casing 2, the friction between the pile extracting casing 2 and the inner and outer ground is cut, and the pile extracting casing 2 is pulled out together with the outer auger 3.

[0019] The existing piles are then removed using a crane. EXAMPLES

[0020] In the case of claim 2, the biaxial auger 7 as shown in Figure 4 equipped with the pile extracting casing 2 is installed on the outer output shaft 9, and water is supplied and discharged from the swivel device 5a for the inner rotating shaft of the biaxial auger 7 via the swivel device 5b for the outer rotating shaft through the water piping 6 to the tip of the pile extracting casing 2, driving the biaxial auger 1 to perform rotary excavation.

[0021] Next, when the excavation has been completed to a depth deeper than the length of the existing pile, the same operation as in Example 1 is carried out to pull out the existing pile. [Explanation of symbols]

[0022] 1 Separate twin-shaft coaxial auger 2. Pile-pulling casing 3 Outer Auger 4. Drum flange 5 Swivel device 6 Water piping 7. Twin-shaft coaxial auger 8 Pedestal 9 Outer output shaft 10. Shaft Coupling 11 Earth Ogre 12 Output shaft 13 Casing coupling

Claims

1. (A) A separate type biaxial coaxial auger having an inner auger and an outer auger, the inner auger being removable from the separate type biaxial coaxial auger, and the outer auger being used as a rotary drive unit. (B) A casing for pulling out piles is joined to the outer output shaft of the outer auger via a drum flange and a casing coupling, instead of a casing for the outer auger. (c) A swivel device is attached to a hollow portion on the rotation shaft of the outer auger via a pedestal, and a water pipe is arranged from the swivel device through the outside of the pile extraction casing to the tip of the pile extraction casing. Consists of (a), (b), and (c), A pile extraction device that converts the outer auger of a separate twin-shaft coaxial auger.

2. (D) An integrated twin-shaft coaxial auger having an inner auger and an outer auger, the inner auger of which cannot be removed, the inner screw being removed from the inner auger or not attached, and the outer auger being used as a rotation drive unit. (E) A casing for pulling out piles is joined to the outer output shaft of the outer auger via a drum flange and a casing coupling, instead of a casing for the outer auger. (F) A swivel device is provided in the outer output shaft of the outer auger to convert water piping from the water piping of the existing swivel device on the inner output shaft of the inner auger to water piping for the outer output shaft, and water piping is arranged in a line from the swivel device in the outer output shaft through the outside of the pile extraction casing to the tip of the pile extraction casing. Consists of (ni), (ho), and (he). Integrated twin-shaft coaxial auger conversion pile extraction device.

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