JP2014218817A - Earth auger and method for removing underground obstacle - Google Patents

Earth auger and method for removing underground obstacle Download PDF

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Publication number
JP2014218817A
JP2014218817A JP2013098121A JP2013098121A JP2014218817A JP 2014218817 A JP2014218817 A JP 2014218817A JP 2013098121 A JP2013098121 A JP 2013098121A JP 2013098121 A JP2013098121 A JP 2013098121A JP 2014218817 A JP2014218817 A JP 2014218817A
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Japan
Prior art keywords
auger
earth auger
earth
obstacle
spiral
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JP2014218817A5 (en
Inventor
辰弥 駒澤
Tatsuya Komazawa
辰弥 駒澤
和男 駒澤
Kazuo Komazawa
和男 駒澤
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日本ベース株式会社
Nippon Beesu Kk
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Priority to JP2013098121A priority Critical patent/JP2014218817A/en
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Publication of JP2014218817A5 publication Critical patent/JP2014218817A5/ja
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling

Abstract

An earth auger that can efficiently perform the removal of underground obstacles, thereby shortening the construction period, and is not subject to the overhead restriction at the construction site, and an underground obstacle using the earth auger Provide removal method.
An earth auger (1) comprising an auger screw (2) provided with spiral blades (5) on the outer periphery of auger shafts (4, 6) and an auger head (3) attached to the tip thereof and having a cutting bit (20). In order to hold 1 by the chuck mechanism of the all-round rotary excavator, a cylindrical holding portion 8 was provided on the outer periphery of the spiral blade 5. The grip 8 has an opening between the upper and lower blade portions of the spiral blade 5 and is provided with a spiral notch 15 to prevent clogging between the blade portions.
[Selection] Figure 1

Description

  The present invention relates to an earth auger and an underground obstacle removing method, and more particularly to a technique for removing an underground obstacle such as an existing pile foundation which becomes an obstacle in constructing a new structure.
  Since pile foundations, underground walls, underground beams, etc. of existing structures are obstacles to the construction of new structures, construction work to remove such underground obstacles is generally performed in advance. .
  As a conventional underground obstacle removal method, a casing rotary excavation method is frequently used. In this method, an all-round rotary excavator installed on the ground is used to rotationally press-fit a casing with a cutting bit at the tip to make a cylindrical cut into the obstacle, and the obstacle inside is protected while the hole wall is protected by the casing. It is a construction method to remove. In order to remove the obstacle, a method is adopted in which a hammer grab or chisel (weight) is freely dropped into the casing to crush the obstacle, and the crushed material is discharged to the ground by the hammer grab.
  However, crushing obstacles caused by hammer grabs or chisel drops is accompanied by significant noise and vibration. For this reason, a technique for removing the obstacle in the casing by cutting it into a circle and a technique for crushing and removing the obstacle with a breaker or a crusher have been proposed (see Patent Documents 1 and 2).
  These proposed technologies have solved the noise and vibration problems associated with the removal of obstacles, but in order to take steps such as press-fitting the casing, cutting or crushing the obstacles in the casing, and then removing them, There is a problem that the construction period becomes long.
  A lock auger method is also known as a method for removing existing piles (see, for example, Patent Document 3). In this method, an earth auger is inserted into a casing having a cutting bit at the tip, and the existing pile is crushed by rotating the casing and the earth auger in opposite directions, and then removed. However, since this drive method has a drive device attached to the leader mast as used in the normal auger method, it cannot apply high torque and a large pushing force to the earth auger or casing. There is a problem in terms of efficiency, and it is difficult to apply in a low-empty construction site.
JP 2005-314871 A JP 2013-19250 A JP 2003-169603 A
The present invention has been made based on the technical background as described above, and achieves the following object.
An object of the present invention is to provide an earth auger that can efficiently construct ground obstacle removal, thereby shortening the construction period, and is not subject to the overhead restriction of the construction site, and a ground using the earth auger. The purpose is to provide a medium obstacle removal method.
The present invention employs the following means in order to achieve the above object.
That is, the present invention is an earth auger comprising an auger screw having a spiral wing provided on the outer periphery of an auger shaft, and an auger head attached to the tip thereof and having a cutting bit,
In order to hold the earth auger by the chuck mechanism of the all-round rotary excavator, a cylindrical holding portion is provided on the outer periphery of the spiral blade.
  In the earth auger, it is preferable to adopt a configuration in which the gripping portion is provided with a notch opened between upper and lower blade portions of the spiral blade. In this case, the notch is preferably formed in a spiral shape so as to sew the upper and lower wing portions of the spiral wing.
Further, the present invention is an underground obstacle removing method using the earth auger,
Installing the all-round rotary excavator on the ground above the obstacle;
The earth auger is set on the all-round rotary excavator, the gripping part is gripped by the chuck mechanism, the all-round rotary excavator is driven to excavate the ground, and the obstacle is Crushing process;
And a step of pulling up the earth auger along with the crushed material after crushing the obstacle.
  In the above removal method, the auger shaft is hollow, and when the earth auger is pulled up, fluidized treated soil is supplied to the auger shaft, and the fluidized treated soil is injected into the excavation hole from the auger head. Can be adopted.
  According to the present invention, since the gripping part for gripping by the chuck mechanism of the all-round rotary excavator is provided on the outer periphery of the spiral blade of the earth auger, the high torque and large torque are applied to the earth auger using the all-round rotary excavator. The ground and obstacles can be excavated or crushed by applying thrust (pushing force). Therefore, the construction efficiency can be improved and the construction period can be shortened. In addition, construction is possible even at low-empty construction sites.
1 is a front view of an earth auger according to an embodiment of the present invention. It is a front view which shows an example of a perimeter rotary excavator. It is sectional drawing which shows an example of a chuck mechanism. It is a procedure figure which shows the underground obstruction removal method using the earth auger by this invention. It is a figure which shows the procedure following FIG.
  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the earth auger 1 includes an auger screw 2 and an auger head 3. The auger screw 2 has the same structure as that known per se, and has a spiral blade 5 provided on the outer periphery of the screw shaft 4.
  The auger head 3 is also known per se, and has a spiral blade 7 provided on the head shaft 6 and a number of cutting bits 20 provided on the tip of the spiral blade 7. This cutting bit 20 is a cemented carbide bit capable of cutting hard rock and concrete. The head shaft 6 is detachably attached to the tip of the screw shaft 4, and an auger shaft is constituted by these shafts 4 and 6. The auger shafts 4 and 6 are hollow shafts. The configuration described above is the same as that of a known earth auger.
  According to the present invention, the cylindrical gripping portion 8 is provided on the outer periphery of the spiral blade 5 of the auger screw 2. The holding part 8 is made of a steel material having a required thickness, and is fixed to the outer periphery of the spiral blade by welding or the like. The gripping portion 8 is for gripping by the chuck mechanism of the all-round rotary excavator 9 illustrated in FIG. The all-round rotary excavator 9 is a well-known one that is generally used when a casing is rotationally press-fitted into the ground. Elevating cylinders 11 are provided at the four corners of the base frame 10. Are connected.
  A rotating frame 13 having a tapered hole 13a is rotatably supported by the elevating frame 12 (see FIG. 3). The chuck mechanism includes a wedge member 14 that moves up and down along the tapered hole 13a of the rotating frame 13, and a chuck cylinder 21 (see FIG. 2) that drives the wedge member 14. That is, the earth auger 1 according to the present invention is inserted inward of the rotary frame 13 and is gripped by the wedge member 14 inserted between the grip portion 8 and the tapered hole 13a. Therefore, the all-around rotary excavator 1 can apply a high torque to the earth auger 1 and can apply a large thrust (pushing force) as in the case of the casing.
  The chuck mechanism shown in FIG. 3 is a main chuck mechanism that rotates the earth auger 1 and pushes it into the ground. Separately from this, when the rotating frame 13 reaches the lowered position, the chuck mechanism is replaced with the main chuck mechanism. A sub-chuck mechanism for holding the auger 1 is provided.
  Referring again to FIG. 1, the grip 8 has a notch 15 that opens between upper and lower blade portions of the spiral blade 5. In this embodiment, the notch 15 is formed with a predetermined width so as to sew the upper and lower blade portions of the spiral blade 5 of the auger screw 2. Therefore, the notch 15 is continuous in the axial direction of the earth auger 1. The notches are not continuous, and may be a large number of openings provided intermittently between the upper and lower wing portions.
  When the obstacle is removed by the earth auger 1 described later, the crushed object of the obstacle rises together with the earth and sand due to the lifting action of the auger screw 1. When the gripping portion 8 has a cylindrical shape without notches, especially when the earth and sand is clayey, the clay mixture is crushed between the upper and lower blade portions of the spiral blade 5 and the gripping portion 8. There is a risk that the lifting action will not function due to clogging. However, by forming such a notch 15, part of earth and sand such as clay escapes to the outside through the notch 15, so that clogging between wing parts can be prevented.
  Next, the underground obstruction removal method using the earth auger 1 will be described. As shown in FIG. 4, first, the all-round rotary excavator 9 is installed on the ground above the obstacles 16 such as existing piles and underground walls (FIG. 4A). Next, the earth auger 1 is set on the all-round rotary excavator 9, and the earth auger 1 is gripped by the chuck mechanism. Then, the earth auger 1 is rotated and pushed into the ground by the rotation drive mechanism and the thrust mechanism (elevating cylinder 11 in FIG. 2) of the all-round rotary excavator 9, and the ground is excavated ((b) in the figure). At the time of excavation, the grip 8 exhibits not only a function of transmitting the rotational force and thrust of the all-round rotary excavator to the auger shafts 4 and 6 but also a function of protecting the hole wall.
  The all-round rotary excavator 9 pushes the earth auger 1 into the ground as the elevating cylinder 11 repeatedly expands and contracts. However, when the rotary frame 13 reaches the lowered position, the excavation is temporarily stopped, and a sub chuck (not shown) The mechanism holds the earth auger and releases the grip by the main chuck mechanism described above. Then, the elevating frame and the rotating frame 13 are raised by the two extension of the elevating cylinder 11, and the earth auger 1 is again gripped by the main chuck mechanism at the raised position, and the gripping of the sub chuck mechanism is released and excavation is started again. To do.
  When the excavation progresses and the tip of the earth auger 1 reaches the obstacle 16, the obstacle 16 is cut and crushed by the cutting bit 20 of the auger head 3 ((c) in the figure). The crushed material generated at this time rises along the spiral blade 5 by the lift action of the auger screw 2.
  When the tip of the earth auger 1 reaches the lower end of the obstacle 16 and the crushing is completed, the driving of the all-round rotary excavator 9 is stopped (FIG. 5D). Then, a hose 17 for supplying fluidized soil is connected to the upper end of the screw shaft 4. The hose 17 is connected to a mixer truck or the like that transports the fluidized soil. Here, the fluidized soil is a fluidized backfill soil in which a solidifying material such as cement is added to and mixed with construction generated soil. This fluidized soil can adjust the uniaxial compressive strength and flow value by adjusting the amount of solidification material added, and does not require compaction. Therefore, the ground after the obstacle removal can be made the same strength as the surrounding ground.
  When the fluidized soil is prepared for supply, the earth auger 1 is pulled up by driving the all-round rotary excavator 9 ((e) in the figure). At this time, the earth auger 1 is rotated in the same direction as during excavation or is not rotated. Thereby, the earth auger 1 is pulled up with the crushed material accompanied. When the earth auger 1 is pulled up, fluidized soil is supplied to the auger shafts 4 and 6. Then, the fluidized soil 18 is poured into the excavation hole 19 from the tips of the auger shafts 4 and 6 while pulling up the earth auger 1. FIG. 5F shows a state in which the earth auger 1 has been completely lifted, and the all-round rotary excavator 9 is withdrawn to complete the construction.
  As described above, according to the present invention, the grip portion for gripping by the chuck mechanism of the all-round rotary excavator is provided on the outer periphery of the spiral blade of the earth auger. The ground and obstacles can be excavated or crushed by applying a high torque and a large thrust. Therefore, the construction efficiency can be improved and the construction period can be shortened.
  The above embodiment is merely an example, and the present invention can take various aspects. For example, in the above-described embodiment, a long cylindrical holding portion that is continuous over the entire axial direction of the auger screw is provided, but a plurality of short cylindrical holding portions are provided at appropriate intervals in the axial direction. Also good. In this case, since the gap between the upper and lower gripping portions acts in the same manner as the notch 15 shown in the above embodiment, clogging between the blade portions due to the crushed material can be prevented.
  The earth auger according to the present invention is not limited to the removal of underground obstacles but can also be applied to normal ground excavation when excavating a rock or the like.
1: Earth auger 2: Auger screw 3: Screw head 4: Screw shaft (auger shaft)
5: Spiral wing 6: Head shaft (auger shaft)
8: Grasping part 9: All-round rotary excavator 11: Lifting cylinder 12: Lifting frame 13: Rotating frame 13a: Tapered hole 14: Wedge member 15: Notch 16: Obstacle 17: Hose 18: Fluidized soil 20: Cutting bit 21: Chuck cylinder

Claims (5)

  1. An earth auger consisting of an auger screw provided with spiral wings on the outer periphery of the auger shaft, and an auger head attached to the tip thereof and having a cutting bit,
    An earth auger characterized in that a cylindrical gripping portion is provided on the outer periphery of the spiral blade in order to grip the earth auger with a chuck mechanism of an all-round rotary excavator.
  2.   The earth auger according to claim 1, wherein the grip portion is provided with a notch that opens between upper and lower blade portions of the spiral blade.
  3.   3. The earth auger according to claim 2, wherein the notch has a spiral shape formed so as to sew between upper and lower wing portions of the spiral wing.
  4. A ground obstruction removal method using the earth auger according to claim 1, 2 or 3,
    Installing the all-round rotary excavator on the ground above the obstacle;
    The earth auger is set on the all-round rotary excavator, the gripping mechanism is gripped by the chuck mechanism, the all-round rotary excavator is driven to excavate the ground by the earth auger, and the obstacle is Crushing process;
    A step of pulling up the earth auger along with the crushed material after crushing the obstacle.
  5.   The auger shaft is hollow, and fluidized soil is supplied to the auger shaft when the earth auger is pulled up, and the fluidized soil is injected into the excavation hole from the auger head. 4. Underground obstacle removal method described in 4.
JP2013098121A 2013-05-08 2013-05-08 Earth auger and method for removing underground obstacle Pending JP2014218817A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016204940A (en) * 2015-04-21 2016-12-08 三和機材株式会社 Excavator
JP2017020265A (en) * 2015-07-13 2017-01-26 大成建設株式会社 Underground skeleton construction method
JP2017082452A (en) * 2015-10-27 2017-05-18 株式会社技研製作所 Underground obstacle removal attachment and underground obstacle removal method
CN107605408A (en) * 2017-10-30 2018-01-19 陕西隆极机械设备有限公司 Crept into for hard rock-soil layer with irrigating one step completed drill bit of pile machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336395A (en) * 1989-07-03 1991-02-18 Katsumi Kitanaka Earth auger for cast-in-place pile and its auger head
JPH0626290A (en) * 1992-07-08 1994-02-01 Taisei Corp Earth auger pile driver
JPH11181772A (en) * 1997-12-24 1999-07-06 Sato Kensetsu Kogyo Co Ltd Steel pipe pile driving device
JP2012021310A (en) * 2010-07-14 2012-02-02 Higuchi Gikou:Kk Construction and removal methods of soil cement column

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336395A (en) * 1989-07-03 1991-02-18 Katsumi Kitanaka Earth auger for cast-in-place pile and its auger head
JPH0626290A (en) * 1992-07-08 1994-02-01 Taisei Corp Earth auger pile driver
JPH11181772A (en) * 1997-12-24 1999-07-06 Sato Kensetsu Kogyo Co Ltd Steel pipe pile driving device
JP2012021310A (en) * 2010-07-14 2012-02-02 Higuchi Gikou:Kk Construction and removal methods of soil cement column

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016204940A (en) * 2015-04-21 2016-12-08 三和機材株式会社 Excavator
JP2017020265A (en) * 2015-07-13 2017-01-26 大成建設株式会社 Underground skeleton construction method
JP2017082452A (en) * 2015-10-27 2017-05-18 株式会社技研製作所 Underground obstacle removal attachment and underground obstacle removal method
CN107605408A (en) * 2017-10-30 2018-01-19 陕西隆极机械设备有限公司 Crept into for hard rock-soil layer with irrigating one step completed drill bit of pile machine

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