JP4863343B2 - Drilling device and press-fitting machine - Google Patents

Description

The present invention relates to that cutting hole apparatus and pressed machine to excavate the ground.

  A three-point earth auger is known as a device for excavating hard ground to form a hole. An excavation head for excavating hard ground is connected to the lower end of the auger screw provided in the earth auger.

As an excavation head, for example, there is one having wings protruding in a direction substantially perpendicular to the axis from the lower end of a rotating shaft, and excavation claws provided at equal intervals in the radial direction on the wing (for example, Patent Document 1). reference). In the conventional three-point earth auger, the excavation claw is pressed against the ground by its own weight, and the excavation claw is rotated to cut the ground.
JP 2004-124695 A

  However, in the above-described drilling method, as shown in FIG. 6, the excavation claw 61 of the excavation head 60 rotates at the same angular velocity both on the outside and on the inside, so the peripheral speed is faster toward the outside and slower toward the inside. For this reason, when the outer excavation claw is set to an appropriate peripheral speed, the inner excavation claw is significantly slowed and the excavation efficiency is poor. Then, by stirring the same soil for a long time, it is kneaded with the water in the soil and becomes mud, so that the discharge of the soil by the auger screw is reduced and the excavation efficiency is further deteriorated.

  On the other hand, when the inner excavation claw is set to an appropriate peripheral speed, the outer excavation claw becomes significantly faster, the excavation claw is severely damaged, and there is a problem that the replacement frequency is high.

  Also, in order to increase excavation capacity, it is necessary to push the auger head downward, but the conventional three-point earth auger used its own weight as a reaction force. There was a fear that the drilling capacity was limited.

An object of the present invention is that the excavation efficient, and to provide a hole apparatus and pressed machine cutting damage has less of excavation teeth.

In order to solve the above problems, the invention described in claim 1 is a hole drilling device, for example, as shown in FIGS. A head portion 31 and a center head 32 provided at the center of the outer peripheral head 31, and the outer head 31 and the central head 32 are provided with an excavation head 30 that is independently rotatable and vertically movable, The outer peripheral head 31 is connected to a hollow central tube 23, and the central head 32 is connected to a central shaft 25 that is passed through the central tube 23, and the first rotating the central tube 23 is rotated. A driving device 43; a first vertical movement device (first child cylinder 42) for moving the central tube 23 up and down; a second driving device 45 for rotating the central shaft 25; and a first moving device for moving the central shaft 25 up and down. 2 Vertical movement device (second Sunda 44) and provided with, and the outer peripheral portion head 31, and the center head 32, is rotated at a different speed, the peripheral speed of the outermost of the excavation teeth 33 of the central head 32, the outer peripheral portion It is characterized by matching with the peripheral speed of the outermost excavation claw 33 of the head 31.
According to a second aspect of the invention, a drilling device according to claim 1, characterized in that said outer peripheral portion the head 31 has a substantially conical shape.

According to the first aspect of the present invention, since the outer peripheral head 31 and the central head 32 are formed to be independently rotatable, each can be rotated at an appropriate peripheral speed. By rotating the head 32 at a higher speed than the outer peripheral head 31, the peripheral speed of the excavation claw 33 of the central head 32 is adjusted to the same level as the peripheral speed of the excavation claw 33 of the outer peripheral head 31 to improve excavation efficiency. Can do.

  Further, in the conventional excavation head 30, when the ground 1 is excavated while rotating the excavation head 30 in a certain direction, there is a problem that the drilling direction is shifted to the rotation direction of the excavation head 30. When the head 31 is rotated in the opposite direction, the direction deviation of the hole 3 can be reduced.

  Further, since the central head 32 and the outer peripheral head 31 are independently movable up and down, excavation can be performed only with either the central head 32 or the outer peripheral head 31, for example, the central head 32. The guide hole 4 can be drilled in advance, and then the outer peripheral head 31 can cut the guide hole 4 along the guide hole 4.

The invention according to claim 3 is the hole drilling device 20 according to claim 1 or 2 , wherein the device for striking or vibrating the outer peripheral head 31 and / or the central head 32 (the striking device 47, the vibration generator). Device 48).

According to the third aspect of the present invention, the striking device 47 or the vibration generating device 48 can be used to rapidly drill holes by striking or vibrating the outer peripheral head 31 and / or the central head 32.

Invention of Claim 4 is the pile or sheet pile press-in machine 10 provided with the drilling apparatus 20 as described in any one of Claims 1-3 , Comprising: The existing pile (steel pipe pile 5) or sheet pile A gripping means (clamp 11) for gripping the (steel sheet pile 2) and a press-fitting means (chuck 14) for pressing the pile or sheet pile by taking a reaction force by gripping an existing pile or sheet pile by the gripping means. ), And the press-fitting means press-fits a pile or a sheet pile by assisting the excavation of the ground 1 with the drilling device 20 provided with the excavation head 30.

In the conventional method, a force exceeding the weight of the apparatus could not be applied to the excavation head 30. However, according to the invention described in claim 4 , the drilling apparatus 20 including the excavation head 30 is held by press-fitting means. In addition, since a force is applied to the excavation head 30 by taking a reaction force by grasping an existing pile or sheet pile by the grasping means, there is no fear of overturning, and a force exceeding the weight of the device can be applied. Drilling can be performed safely and more efficiently.

  ADVANTAGE OF THE INVENTION According to this invention, an outer peripheral part head and a center part head can be rotated at a suitable peripheral speed, and excavation efficiency can be improved. Further, when the center head and the outer peripheral head are rotated in the opposite directions, the direction deviation of the hole drilling can be reduced.

  Also, by cutting the guide hole in advance with the center head, the ground of the outer periphery of the guide hole becomes weak, and then the force applied to the outer periphery head when drilling with the outer periphery head along the guide hole Can be reduced.

  Further, by drilling the outer peripheral portion after drilling the guide hole with the center portion head, core runout is reduced, accuracy in the drilling direction is improved, and damage to the excavation claw can be reduced. In addition, noise due to runout can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail. 1 and 2 show a drilling device 20 including an excavation head 30 according to an embodiment of the present invention. The hole drilling device 20 is supported by the press-fitting machine 10. The press-fitting machine 10 includes a clamp 11 (gripping means) that detachably grips a pile or sheet pile (steel sheet pile 2) that has been press-fitted from the inside and takes a reaction force from the pile or sheet pile, and a saddle 12 that operates the clamp 11. And a mast 13 provided so as to be movable in the front-rear direction (row direction of the steel sheet pile 2) with respect to the saddle 12 and turnable so that the direction can be changed to the left and right with respect to the saddle 12. A main part is constituted by a chuck 14 (press-fitting means) that is supported so as to be able to move up and down and detachably grips a pile or sheet pile to be press-fitted and press-fits the pile or sheet pile gripped by raising and lowering. The press-fitting machine 10 according to the present embodiment grips a casing pipe 21 (to be described later) together with a steel sheet pile 2 with a chuck 14. Here, as the steel sheet pile 2 shown in FIGS. 1 and 2, a sheet pile having a U-shaped cross section, a Z-shape, or a hat shape can be used.

  The hole drilling device 20 includes an excavation head 30, a casing tube 21, a central tube 23, a central shaft 25, and an auger drive device 40.

  The excavation head 30 includes an outer peripheral head 31 and a central head 32. The outer peripheral head 31 has a substantially conical shape having an apex at the bottom, and a central head 32 is disposed at the lower end of the central portion. Excavation claws 33 are arranged below the outer peripheral head 31 in the radial direction. The upper end of the outer peripheral head 31 is connected to the lower end of the central tube 23. In addition, a vertical hole is formed at the center of the outer peripheral head 31, and the central shaft 25 passes therethrough.

  The center part head 32 is disposed at the lower end of the center part of the outer peripheral part head 31 and has a substantially conical shape having an apex downward. Under the central head 32, excavation claws 33 are arranged in the radial direction. The upper end of the center part head 32 is connected to the lower end of the center axis | shaft 25 mentioned later. The central head 32 is rotatable and vertically movable with respect to the outer peripheral head 31.

  The casing tube 21 is held by being held by a chuck 14 that holds the steel sheet pile 2 and houses a central tube 23 therein. The central tube 23 is hollow, provided with a spiral blade 24 on the outer peripheral portion, and functions as an auger screw.

An outer peripheral head 31 is connected to the lower end of the center tube 23. In addition, a first driving device 43 described later is connected to the upper end of the center tube 23.
A center shaft 25 is accommodated in the center tube 23. A central head is connected to the lower end of the central shaft 25. A second driving device 45 described later is connected to the upper end of the central shaft 25.

A casing 41 of an auger drive device 40 is connected to the upper part of the casing tube 21.
The auger drive device 40 includes a housing 41, a first cylinder 42, a first drive device 43, a second cylinder 44, a second drive device 45, and a rail 46 as constituent elements. Further, a striking device 47 and a vibration generator 48 may be provided.

  The rail 46 supports the first driving device 43 and the second driving device 45 so as to be slidable in the vertical direction. The first cylinder 42 has a lower end connected to the housing 41 and an upper end connected to the first driving device 43. As the first cylinder 42 expands and contracts, the first drive unit moves up and down along the rail 46. The first drive unit is connected to the upper end of the central tube 23 and rotates the central tube 23 and the outer peripheral head 31. Further, when the first drive unit moves up and down, the central tube 23 and the outer peripheral head 31 move up and down.

  The second cylinder 44 has a lower end connected to the first driving device 43 and an upper end connected to the second driving device 45. As the second cylinder 44 expands and contracts, the second drive unit moves up and down relative to the first drive unit along the rail 46. The second drive unit is connected to the upper end of the central shaft 25 and rotates the central shaft 25 and the central head 32. Further, when the second drive unit moves up and down, the center shaft 25 and the center head 32 move up and down.

  The striking device 47 and the vibration generating device 48 are provided at the upper end of the central shaft 25. The striking device 47 strikes the central shaft 25. The vibration generator 48 applies vibration to the central shaft 25. As the striking device 47 and the vibration generating device 48, known devices can be used. The striking device 47 and the vibration generating device 48 may be provided in the central tube 23.

  In the excavation head 30 of the present invention, since the outer peripheral head 31 is driven by the central tube 23 and the central head 32 is driven by the central shaft 25, both can be rotated at different speeds. For this reason, by rotating the central head 32 at a higher speed than the outer peripheral head 31, the peripheral speed of the outermost excavation claw 33 of the central head 32 is changed to the outermost portion of the outer peripheral head 31 as shown in FIG. It is possible to match the peripheral speed of the excavation claw 33. Thereby, the excavation efficiency of the excavation claw 33 of the center part head 32 can be improved.

  It is also possible to excavate while rotating the outer peripheral head 31 and the central head 32 in opposite directions. In the conventional excavation head 30, when the ground 1 is excavated while rotating the excavation head 30 in a certain direction, there has been a problem that the drilling direction is shifted to the rotation direction of the excavation head 30. By rotating 31 in the opposite direction, it is possible to reduce the direction shift of the hole 3.

  Furthermore, in the excavation head 30 of the present invention, the outer peripheral head 31 and the central head 32 can be moved up and down independently, so that, for example, drilling can be performed by the following procedure.

  (1) First, the casing tube 21 is gripped together with the steel sheet pile 2 by the chuck 14 of the press-fitting machine 10, and the central head 32 is rotated at a higher speed than the outer peripheral head 31 in this state, as shown in FIG. As shown, the second cylinder 44 is contracted to lower the central head 32 and the guide hole 4 is drilled. At this time, since the downward load is concentrated on the central head 32, it is possible to excavate efficiently with a small load.

  Although the position of the outer peripheral head 31 does not have to be lowered while the central head 32 is being lowered, the outer peripheral head 31 is lowered more slowly and continuously than the central head 32 to guide the guide hole 4. You may excavate the outer periphery. At that time, the outer peripheral head 31 may be lowered by contracting the first cylinder, or the outer peripheral head 31 may be lowered by applying a downward load to the casing tube 21 by the chuck 14.

  (2) Next, the second cylinder 44 is extended, and the central head 32 is raised and returned to the position of the outer peripheral head 31 as shown in FIG. Next, the first cylinder 42 is contracted, or the chuck 14 holding the casing tube 21 is lowered, the outer peripheral head 31 and the central head 32 are lowered, and the outer peripheral head 31 excavates the outer peripheral portion of the guide hole 4. To do.

  (3) Further, as shown in FIG. 4 (c), when the outer peripheral head 31 and the central head 32 approach the bottom of the guide hole 4, the chuck 14 is opened and raised, until the casing tube 21 again. Grab the upper part from the position you were grabbing.

  While repeating the above (1)-(3) to form the hole 3 having a predetermined depth, the steel sheet pile 2 is press-fitted along the hole 3. In this way, by drilling with the center head 32 in advance, and then lifting the center head 32, a space is created in the guide hole 4, the ground 1 in the outer peripheral portion of the guide hole 4 becomes weak, and the guide The force applied to the outer periphery head 31 when excavating the outer periphery of the hole 4 can be reduced. Further, by excavating the outer periphery of the guide hole 4 after drilling the guide hole 4, the center runout is reduced, the accuracy in the drilling direction is improved, and damage to the excavation claw 33 can be reduced. In addition, noise due to runout can be reduced.

  Furthermore, when excavating, it is possible to excavate more efficiently by striking the center head 32 and the outer peripheral head 31 with the striking device 47 or with the vibration generator 48.

  In FIG. 1, the casing pipe 21 is supported by the chuck 14 of the press-fitting machine 10 together with the steel sheet pile 2, but for example, as shown in FIG. 5, a clamping device 50 that holds the steel pipe pile 5 is provided on the casing pipe 21. The hole drilling device 20 in a state where the steel pipe pile 5 is grasped by the clamp device 50 may be press-fitted together with the steel pipe pile 5. Moreover, instead of press-fitting the steel pipe pile 5, an arbitrary cylindrical member may be press-fitted, and in addition, a steel pipe sheet pile having a joint on the steel pipe pile, an H steel sheet pile, a PC wall body, or the like is press-fitted. May be.

  As shown in FIG. 5, the clamp device 50 includes a pile fixing claw 51 on the side surface portion. The pile fixing claw 51 extends and contracts in the horizontal direction. The pile fixing claw 51 can be stretched in the radial direction inside the steel pipe to grip the steel pipe, or can be stretched in the web direction between the flanges of H steel to grip the H steel.

  In the above embodiment, drilling is performed using the press-fitting machine 10, but the present invention is not limited to this, and a conventional three-point earth auger or the like may be used. Further, the device for moving the central tube 23 and the central shaft 25 up and down is not limited to the cylinder, and it is needless to say that specific detailed structures such as the arrangement thereof can be appropriately changed.

It is an elevation view which shows the drilling apparatus of this invention attached to a press-fitting machine. It is AA sectional drawing of FIG. It is a schematic diagram which shows the arrangement | sequence of the excavation nail | claw provided in the excavation head of this invention. (A)-(c) is a vertical sectional view which shows the drilling method of this invention. It is an elevation view which shows the hole drilling apparatus of this invention. It is a schematic diagram which shows the arrangement | sequence of the excavation nail | claw provided in the conventional excavation head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground 2 Steel sheet pile 4 Guide hole 5 Steel pipe pile 10 Press-fit machine 20 Drilling device 23 Center pipe 25 Center shaft 30 Excavation head 31 Outer part head 32 Center part head 33 Excavation claw 42 1st cylinder 43 1st drive device 44 2nd Cylinder 45 Second drive device 47 Blow device 48 Vibration device

Claims (4)

It has an excavation claw for excavating the ground while rotating, and consists of an outer peripheral head and a central head provided at the center of the outer peripheral head. The outer peripheral head and the central head can be independently rotated and moved vertically. A free excavation head, wherein the outer peripheral head is connected to a hollow central tube, and the central head is connected to a central axis that is passed through the central tube, and rotates the central tube A first drive device; a first vertical motion device that moves the central tube up and down; a second drive device that rotates the central axis; and a second vertical motion device that moves the central axis up and down. The head of the head and the central head are rotated at different speeds, and the peripheral speed of the outermost excavation claw of the central head is matched to the peripheral speed of the outermost excavation claw of the outer peripheral head. Characterized by Hole equipment. The drilling device according to claim 1 , wherein the outer peripheral head has a substantially conical shape. Drilling apparatus according to claim 1 or 2, characterized in that it comprises a device for applying a striking or vibrating the outer peripheral portion head and / or the central head. A pile or sheet pile press-fitting machine comprising the drilling device according to any one of claims 1 to 3 , wherein a gripping means for gripping an existing pile or sheet pile, and an existing And press-fitting means for press-fitting the pile or sheet pile by gripping the pile or sheet pile, and the press-fitting means assists in excavating the ground with a drilling device equipped with the excavation head. A press-fitting machine characterized by press-fitting piles or sheet piles.

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