JP3663451B2 - Pile hole drilling method and pile hole drill rod - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a pile hole excavation method for performing bottom-expansion excavation in a pile medium excavation method and a pile hole excavation rod used for the pile hole excavation method.
[0002]
[Prior art]
Conventionally, in the structure of a pile hole drilling rod in which the drilling arm having the drilling blade is operated by expanding the drilling arm by rotating the rod without using hydraulic or pneumatic pressure, the drilling rod with the drilling blade is drilled at the lower end of the rod. The arm was provided and the swinging excavating arm was opened by friction with the pile hole wall. At this time, the excavation arm swings to the stopper on one side by forward rotation of the rod to excavate the pile hole shaft, and the excavation arm swings to the stopper on the other side by inversion of the rod to widen the bottom of the pile hole The part was excavated, and the diameter of the excavation was selected according to the direction of rotation of the rod.
[0003]
Moreover, when the rod was rotated forward, the excavated soil was discharged out of the pile through the hollow portion of the pile by a spiral blade installed on the outer wall of the rod.
[0004]
[Problems to be solved by the invention]
In the conventional excavation head, the rod was reversed when excavating the bottom of the pile hole, so that the excavated soil that had risen in the pile by the spiral blade during the forward rotation of the rod dropped into the pile hole due to the reverse rotation. There was a problem to do. In addition, in order to prevent the fall of the excavated soil, when the shaft excavation is completed, the rod is idled, the excavated soil accumulated in the spiral wing is discharged to the ground, and then the rod is rotated in reverse to expand the bottom portion. There was a problem that drilling efficiency was poor.
[0005]
[Means for Solving the Problems]
However, this invention changes the relative position of the inner / outer double rod consisting of the outer rod with the operating edge and the inner rod with the excavation head, and rotates the double rod in the same direction to excavate the shaft portion and bottom expansion portion of the pile hole. So, the above problem was solved.
[0006]
That the present invention is consecutively provided the operating tube the lower end of the outer rod, the outer rod forming operation margin at the lower end of the operating tube, rotating vertically movable, double Rod made by inserting the inner rod And connecting a drilling head having a drilling arm with a drilling blade swingably attached to the lower end of the inner rod, and loosely fitting the operation tube on the upper part of the drilling head to constitute a double rod, While excavating the shaft portion of the pile hole while rotating the double rod in one direction, the outer rod is raised or lowered to change the relative position of the operation edge and the excavation rod, and the operation of the outer rod The edge of the excavation arm is restricted by the edge to restrict the excavation diameter and the excavation blade of the excavation head is expanded, and then the double rod is rotated in one direction to It is a pile hole excavation method in the medium excavation method characterized by excavation. Further, a double rod is formed by continuously connecting an operating cylinder to the lower end of the outer rod, and inserting the inner rod through the outer rod having an operating edge formed at the lower end of the operating cylinder so as to be rotatable up and down. A drilling head having a drilling arm with a drilling blade attached to the lower end of the inner rod is connected to the lower end of the inner rod, and the operation tube is loosely fitted to the upper part of the drilling head to form a double rod, and the outer rod is Hook the inner rod at the first position, rotate the double rod in one direction, and place the excavating arm against the operation edge at the first position to increase the maximum angle of swing. With the excavation arm of the regulated excavation head, excavate the shaft portion of the pile hole, then stop the rotation of the double rod, raise the outer rod to the second position relative to the inner rod , Both rods in position, then rotate the double rod in the one direction, the second position Wherein said excavating arm operating edge in digging arm of the drilling head is restricted maximum angle of swing by To設a pile holes drilled in Chuho method which is characterized by drilling a拡底of Kuiana in Is the method.
[0007]
Further, the inner rod rotating vertically movably inserted into the outer rod, the lower end of the inner rod, made by connecting a drilling head provided swingably excavation bladed drilling arm, the lower end of the outer rod the consecutively provided an operation tube that can be loosely fitted on the upper end of the drilling head, the lower edge of the operating tube, and contact with the excavating arm, the maximum angle possible regulatory operations edge of the swinging of the drilling arm A pile hole drilling rod characterized by being formed. Furthermore, a latching projection is provided at a predetermined position on the outer wall surface of the inner rod, and a latching vertical hole into which the latching projection can be inserted is provided in the axial direction in the outer rod. The first latching horizontal hole that can be inserted and latched at the position corresponding to the time of excavation of the part, and the second latching lateral hole that can be inserted and latched at the position corresponding to the time of excavation of the bottom of the pile hole These are pile hole excavation rods that are connected in series.
[0008]
[Action]
By the rotation of the rod in one direction, the shaft portion and the bottom expanded portion of the pile hole can be excavated by the excavation head. By raising and lowering one of the inner and outer rods, the relative position in the vertical direction of the inner and outer rods can be changed, and the swinging of the excavating arm of the excavating head can be regulated by the operation edge of the outer rod.
[0009]
Further, since the operating edge of the outer rod limits the maximum angle of swinging of the excavating arm, the excavation diameter can be regulated. In addition, the latching vertical hole of the outer rod and the latching protrusion of the inner rod are guided to each other, and the relative position in the vertical direction between the inner rod and the outer rod can be changed. Also, by changing the relative position of the outer rod and the inner rod in the rotational direction, the latching protrusion of the inner rod is inserted into the latching lateral hole of the outer rod, and the vertical direction between the inner rod and the outer rod is changed. The relative position of each can be maintained.
[0010]
[Example 1]
Embodiments of the present invention will be described with reference to the drawings.
[0011]
First, the configuration of the excavation head will be described. The base 3 of the head main body 1 having the connecting portion 2 to the inner rod at the upper end is a substantially rectangular parallelepiped upper portion 4, and the lower portion 5 of the base 3 is gradually flattened and thinned in one direction from the intermediate portion to the tip. Excavation blades 7 and 7 are projected from the lower edge of the lower portion 5 with the cutting edge facing substantially downward. At the base 3 of the head body 1, horizontal shafts 8 project from the opposite side surfaces 3 a and 3 a in the other direction perpendicular to the one direction, and the base ends of the excavating arms 9 and 9 are provided at both ends of the horizontal shaft 8. Each of the parts 10 is rotatably attached. The intermediate portion 11 of the excavation arm 9 is bent toward the head main body 1 along the outer wall surface of the lower portion 5 of the head main body 1, and the distal end portion 12 of the excavation arm 9 is bent away from the head main body 1. (FIG. 4). In addition, three excavation blades 13 and 13 are projected from the distal end portion 12 of the excavation arm 9 with a predetermined interval with the cutting edges facing downward and outward.
[0012]
Further, a hollow portion 14 for supplying cement milk is formed in the head main body 1 in the vertical direction from the upper end of the connecting portion 2 (FIG. 5B), and a cement milk discharge port 15 is provided at the center of the lower end of the head main body 1. Form. The excavation head 16 is configured as described above (FIGS. 1 and 3).
[0013]
Next, the thin cylindrical inner rod 21 is inserted into the cylindrical outer rod 18 so as to be able to rotate up and down, and the connecting portion 2 of the excavation head 16 is inserted into the connecting portion 23 at the lower end of the inner rod 21. Connect. The lower end portion of the outer rod 18 is provided with an operation cylinder 19 that can be loosely fitted to the upper portion 4 of the head body 1 of the excavation head 16.
[0014]
At the lower end of the operation cylinder 19, operation edges 20, 20 are formed from the lower edge facing the other side 3 b (the other side 3 a provided with the excavating arm) of the base 3 of the head body 1, respectively. The operating edge 20 abuts against the excavating arms 9 and 9 during excavation of the pile hole shaft portion at the first position (relative position of the outer rod 18 and the inner rod 21; lower position, FIG. 2) and restricts the opening thereof. In the second position (relative position between the outer rod 18 and the inner rod 21; upper position; FIG. 3), it can abut against the excavating arms 9 and 9 during excavation of the bottom of the pile hole, and the opening thereof can be regulated. .
[0015]
A latching protrusion 24 projects from the outer wall surface 22a of the lower end portion 22 of the inner rod 21 toward the outer rod 18 side. A latching vertical hole 26 into which the latching protrusion 24 can be inserted is formed in the outer rod 18. When the latching vertical hole 26 is in the first position, the latching protrusion 24 abuts on the upper edge 27 of the latching vertical hole 26, and when the latching vertical hole 26 is also in the second position, the latching protrusion 24 is 26 is formed in such a shape as to abut on the lower edge 28. Therefore, the outer rod 18 and the inner rod 21 can be moved up and down between the upper edge 27 and the lower edge 28 of the latching vertical hole 26 of the latching protrusion 24 (FIGS. 6A and 6B).
[0016]
In addition, a first horizontal hole 29 into which the latching protrusion 24 can be inserted is connected to the lower end of the latching vertical hole 26 of the outer rod 18. Similarly, the 2nd horizontal hole 30 which can insert the said latching protrusion 24 is connected with the upper end part of the latching vertical hole 26 of the said outer rod.
[0017]
The pile hole excavation rod 31 is configured as described above (FIGS. 1 and 4).
[0018]
Next, the use of the present invention based on the above embodiment, that is, the pile hole excavation method of the present invention will be described.
[0019]
The pile hole excavating rod 31 is inserted through the hollow portion 34 of the hollow pile 33 (FIG. 1).
[0020]
The excavation head 16 of the pile hole excavation rod 31 is projected from the tip of the hollow pile 33, and the pile hole excavation rod 31 is rotated in the direction indicated by the arrow 37 (forward rotation) in FIG. The hollow pile 33 is lowered while excavating (FIG. 2). At this time, the latching protrusion 24 of the inner rod 21 is in the first lateral hole 29 (FIG. 6C), and the relative position (first position) in the vertical direction between the inner rod 21 and the outer rod 18 is set. A predetermined excavation diameter can be maintained without fear of shifting.
[0021]
Next, when excavation of the shaft portion 35 of the pile hole is completed, the rotation of the excavation rod 31 is stopped, and the outer rod 18 is moved in the direction of arrow 39 so that the latching protrusion 24 is positioned in the latching vertical hole 26. Rotate (or rotate the inner rod 21 in the direction of the arrow 38. FIGS. 6 (a) and 6 (d)), further raise the outer rod 18 (or lower the inner rod 21), and It abuts on the lower edge 28 of the retaining vertical hole 26 (FIG. 6 (e), indicated by a chain line 24).
[0022]
Subsequently, the excavation rod 31 is rotated again in the direction indicated by arrow 37 (forward rotation) to excavate the bottom expanded portion 36 of the pile hole. At this time, the latching protrusion 24 is positioned in the second lateral hole 30 (FIG. 6E), and the relative position (second position) in the vertical direction between the inner rod 21 and the outer rod 18 is not shifted, and the predetermined amount is obtained. The drilling diameter can be maintained. The operating edge 20 of the outer rod 18 is in a second position located above the first position, and the swinging width of the excavating arms 9 and 9 of the excavating head 16 is set larger than that in the first position. To do. Therefore, it is possible to excavate the pile hole widened portion 36 having a predetermined diameter (FIG. 3).
[0023]
As described above, the excavation of the pile hole is completed, the rotation of the excavation rod 31 is stopped, the cement milk is discharged from the discharge port 15, the excavation rod 31 is pulled up through the hollow portion 34 of the pile 33, and the pile 33 Is lowered, and the lower end portion is fixed in the expanded bottom portion 36 (not shown).
[0024]
In the above-described embodiment, the configuration of the excavation head 16 is not limited to the above-described embodiment, and may be any structure as long as the shaft portion of the pile hole can be excavated by the rotation of the rod and excavated to expand the bottom portion. Other structures can also be used (not shown).
[0025]
Moreover, in the said Example, the latching protrusion 24 was attached to the inner rod 21 so that the relative position in the raising / lowering direction of the inner rod 21 and the outer rod 18 could take 2 positions (1st position, 2nd position). Is provided with a latching vertical hole 26 and lateral holes 27, 28, but if the inner rod 21 and the outer rod 18 can take two positions (first position, second position) in the ascending / descending direction, Other structures can also be used. For example, a latching protrusion 24 can be provided on the outer rod 18, and a latching vertical hole 26 and latching lateral holes 27, 28 can be provided on the inner rod 21 (not shown).
[0026]
Moreover, in the said Example, although the pile hole was excavated using the said pile hole excavation rod 31, excavation fixed to one rod by changing the relative position of a rod using the inner and outer double rod. Pile hole drilling rods of other structures can be used as long as the shaft part and the bottom of the pile hole can be excavated by manipulating the expansion of the rod and rotating the excavating rod only in one direction.
[0027]
【The invention's effect】
By moving the inner and outer rods up and down to change their relative positions, the outer edge of the outer rod can be easily and reliably operated to expand the excavation arm of the excavation head. There is an effect that the portion can be reliably excavated with a predetermined diameter.
[0028]
In addition, since the excavation arm swings only on one side of the surface of the head body to which the excavation arm is attached, there is a space for installing various measuring instruments, excavation soil collectors, etc. on the side of the head main body where the excavation arm is not attached. It is possible to secure the drilling head and to effectively use the drilling head.
[0029]
In addition, when the inner rod is provided with a latching projection and the outer rod is provided with a latching vertical hole and a latching horizontal hole, the latching vertical hole and the latching projection are guided to each other, and the inner rod and the outer rod are guided. The first position and the second position in the vertical direction with respect to the rod can be maintained, and the excavation rod can be reliably operated.
[Brief description of the drawings]
FIG. 1 is a front view in which an inner and outer rod according to an embodiment of the present invention is cut off, and shows a state during non-excavation.
FIG. 2 is a front view in which the inner and outer rods are also broken, and shows the shaft hole excavation of the pile hole.
FIG. 3 is a front view in which the inner and outer rods are broken, and shows the time when excavating the bottom of the pile hole.
FIG. 4 is a side view in which the inner and outer rods are similarly broken, and shows a non-excavated state.
5A is a cross-sectional view taken along line AA in FIG. 2, and FIG. 5B is a cross-sectional view taken along line BB in FIG.
FIGS. 6A and 6B are diagrams showing a latching state of a latching protrusion of an inner rod and a latching hole of an outer rod in an embodiment of the present invention, in which FIG. 6A is a partial perspective view, and FIG. , (C) is a schematic partial front view showing a shaft excavation state, (d) also showing a state in the middle of switching, and (e) showing an expanded bottom excavation state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Head main body 3 Base 7 Excavation blade 9 Excavation arm 13 Excavation blade 16 Excavation head 18 Outer rod 19 Operation cylinder 20 Operation edge 21 Inner rod 24 Latching protrusion 26 Latching vertical hole 29 First latching horizontal hole 30 Second latching Horizontal hole 31 Pile hole drilling rod 33 Hollow pile 35 Pile hole shaft part 36 Pile hole widening part

Claims (4)

Consecutively provided the operating tube the lower end of the outer rod, the outer rod forming operation margin at the lower end of the operating tube, rotating vertically movable, a double Rod made by inserting the inner rod, the A drilling head having a drilling arm with a drilling blade attached to the lower end of the inner rod is swingably connected, and the operation tube is loosely fitted to the upper part of the drilling head to form a double rod.
While excavating the shaft portion of the pile hole while rotating the double rod in one direction, the outer rod is raised or lowered to change the relative position of the operation edge and the excavation rod, and the operation of the outer rod The edge of the excavation arm is restricted by the edge to limit the diameter of the excavation and the excavation blade of the excavation head is expanded, and then the double rod is rotated in one direction to Pile hole excavation method in the medium excavation method characterized by excavation. Consecutively provided the operating tube the lower end of the outer rod, the outer rod forming operation margin at the lower end of the operating tube, rotating vertically movable, a double rod made by inserting the inner rod, the inner rod A drilling head having a drilling arm with a drilling blade attached to the lower end of the drilling unit is connected to the lower end of the drilling head, and the operation tube is loosely fitted to the upper part of the drilling head to form a double rod.
The outer rod is hooked with respect to the inner rod at the first position, the double rod is rotated in one direction, and the excavating arm is placed on the operation edge at the first position to swing. Drill the shaft part of the pile hole with the excavation arm of the excavation head whose maximum angle is regulated, then stop the rotation of the double rod, and raise the outer rod to the second position with respect to the inner rod by, locks multiplied by the rods in their position, followed by rotating the double rod into said one direction, the maximum angle of swing by To設the drilling arm to the operating edge of said second position A method for excavating a pile hole in an intermediate excavation method , wherein the bottom portion of the pile hole is excavated with an excavation arm of the excavation head. The inner rod rotating vertically movably inserted into the outer rod, the lower end of the inner rod, made by connecting a drilling head provided swingably excavation bladed drilling arm, the drilling to the lower end of the outer rod the operation tube that can be loosely fitted in the upper end portion of the head consecutively provided, the lower edge of the operating tube, and contact with the drilling arm to form a maximum angle possible regulatory operations edge of the swinging of the drilling arm Pile hole drilling rod characterized by that.   A hooking projection is provided at a predetermined position on the outer wall surface of the inner rod, and a hooking vertical hole into which the hooking protrusion can be inserted is provided in the outer rod in the axial direction. A first latching horizontal hole that can insert and latch the latching protrusion at a position corresponding to the time, and a second latching lateral hole that can insert and latch the latching protrusion at a position corresponding to the time of excavation of the bottom of the pile hole The pile hole excavation rod according to claim 3, which is continuously provided.

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