JPH08326457A - Pile hole excavation method and excavating rod - Google Patents

Abstract

PURPOSE: To make it possible to excavate a shaft of a pile and an expanded bottom and enhance the efficiency of excavation and earth removal by rotating an excavating rod in one direction without reversing based on pile installation by inner excavation. CONSTITUTION: An inner rod 21 is inserted into an outer rod 8 so that it may rise and turn freely. An excavation head 16 provided with an excavating arm 9 with an excavating blade 13 is communicated with the lower end of the inner rod 21. An operation cylinder 19 having an operating edge 20, which may be in contact with the excavating arm 9, is continuously installed to the outer rod 18, thereby constituting a pile hole excavating rod 31. The operation edge 20 serves as a stopper which regulates the shaking of the excavating arm 9. With a locking projected part 24 of the inner rod 21 at the position (fist position) of a locking horizontal hole 29 of the outer rod 18, the excavating arm 9 excavates the shaft area 35 of a pile hole by turning the rod in one direction. With the locking projected part 24 at the position (second position) of a locking horizontal hole 30, the expanded bottom 36 of the pile hole is excavated by turning the rod in one direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile hole excavating method for expanding the bottom of a pile in a medium excavation method and a pile hole excavating rod used in the pile hole excavating method.

[0002]

2. Description of the Related Art Conventionally, in the structure of a pile hole excavating rod in which the excavating arm having an excavating blade is operated to expand and expand by rotating the rod without using hydraulic pressure or air pressure, the lower end of the rod is used. An excavating arm with an excavating blade was installed in the machine, and the swinging excavating arm was opened due to friction with the pile hole wall. On this occasion,
The forward rotation of the rod swings the excavation arm to the stopper on one side to excavate the pile hole shaft, and by reversing the rod,
The excavation arm was rocked to the stopper on the other side to excavate the bottom of the pile hole, and the diameter of the excavation was used differently depending on the direction of rotation of the rod.

Further, when the rod is normally rotated, the excavated soil is discharged to the outside of the pile through the hollow portion of the pile by the spiral blade installed on the outer wall of the rod.

[0004]

In the conventional excavating head, the rod is reversed when excavating the bottom portion of the pile hole, so that the spiral blade raises the inside of the pile when the rod is normally rotated. There was a problem that the soil fell into the pile hole due to reverse rotation. In order to prevent the excavated soil from falling, the rod is idled when the shaft excavation is completed, the excavated soil accumulated in the spiral blades is discharged to the ground, and then the rod is rotated in the reverse direction to expand the bottom. Had to be excavated, and there was a problem that the excavation efficiency was poor.

[0005]

SUMMARY OF THE INVENTION However, according to the present invention, the relative positions of the inner and outer double rods, which are the outer rod with the operation edge and the inner rod with the drilling head, are changed and the double rods are rotated in the same direction. Since we are excavating the shaft part and the bottom expansion part of
The above problems were solved.

That is, according to the present invention, an excavating head is connected to a lower end of an inner rod of a double excavating rod formed by inserting an inner rod into an outer rod having an operating edge formed at the lower end, and the double rod is unidirectionally connected. After excavating the shaft portion of the pile hole while rotating, the outer rod is moved up or down to change the relative position of the operation edge and the excavation rod to expand the excavation blade of the excavation head, and then the double A pile hole excavating method in a medium excavation method, characterized in that a rod is rotated in one direction to excavate an expanded bottom portion of a pile hole. Further, an excavating head having an excavating arm with an excavating blade swingably attached is connected to the lower end of the inner rod of the double rod formed by inserting the inner rod into the outer rod having the operation edge formed at the lower end, The rod is hooked with respect to the inner rod at the first position, the double rod is rotated in one direction, and the pile arm of the excavating head is regulated by the operation edge at the first position. Excavating the shank, then stopping the rotation of the double rod, raising the outer rod to a second position relative to the inner rod and hooking both rods at that position, then the double rod By rotating in one direction,
The pile hole excavating method in the intermediate excavation method is characterized in that the excavated arm of the excavating head regulated by the operation edge at the second position excavates the expanded bottom portion of the pile hole.

Further, the inner rod is vertically slidably inserted into the outer rod, and a lower end of the inner rod is connected to an excavating head having an excavating arm with an excavating blade, and the lower end edge of the outer rod is connected to the excavating arm. The pile hole excavating rod is characterized in that an operation edge capable of contacting with is formed. Further, a hooking protrusion 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. First latching lateral hole into which the latching protrusion can be inserted and latched at a position corresponding to excavation of a part, and second latching lateral hole into which the latching protrusion can be inserted and latched at a position corresponding to excavating the bottom of a pile hole. And a pile hole excavating rod, which are respectively connected in series.

[0008]

By rotating the rod in one direction, the excavation head can excavate the shaft portion and the expanded bottom portion of the pile hole. By raising or lowering one of the inner and outer rods, the relative position of the inner and outer rods in the vertical direction can be changed, and the swing of the excavating arm of the excavating head can be restricted by the operating edge of the outer rod.

Further, since the operating edge of the outer rod limits the maximum angle of rocking of the excavating arm, the excavation diameter can be regulated. Further, the hooking vertical hole of the outer rod and the hooking protrusion of the inner rod are guided to each other, so that the vertical relative position of 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 rotation direction to, the latching projection of the inner rod is inserted into the latching lateral hole of the outer rod, and the vertical direction of the inner rod and the outer rod is changed. Can maintain their relative positions respectively.

[0010]

Embodiment 1 An embodiment of the present invention will be described with reference to the drawings.

First, the structure of the excavating head will be described.
Head body 1 having a connecting portion 2 with an inner rod at the upper end
The base 3 is formed such that the upper part 4 is a substantially rectangular parallelepiped, and the lower part 5 of the base 3 is gradually flattened and thinned in one direction from the middle part to the tip. The digging blades 7, 7 are provided so as to extend substantially downward. The head body 1
In the base part 3 of the above, horizontal shafts 8 are projected on the opposite side surfaces 3a, 3a in the other direction orthogonal to the one direction, and the base ends 10 of the excavating arms 9, 9 are respectively provided at both ends of the horizontal shaft 8. Attach it rotatably. The middle portion 11 of the excavating arm 9 is the head body 1
The outer wall of the lower portion 5 is bent toward the head body 1 side, and the tip portion 12 of the excavating arm 9 is formed so as to be bent away from the head body 1 (FIG. 4). Further, at the tip portion 12 of the excavating arm 9, three excavating blades 13, 13 are provided at predetermined intervals so as to project their blade tips downward and outward.

In addition, a hollow portion 14 for supplying cement milk is formed in the head body 1 from the upper end of the connecting portion 2 in the vertical direction (FIG. 5B), and the cement milk is provided at the center of the lower end of the head body 1. The ejection port 15 is formed. The excavation head 16 is configured as described above (FIGS. 1 and 3).

Next, an inner rod 21 having a thin cylindrical shape is inserted into the outer rod 18 having a cylindrical shape so that the inner rod 21 can be rotated and moved up and down, and the connecting portion 23 of the excavating head 16 is connected to the connecting portion 23 at the lower end of the inner rod 21. Is inserted and connected. A lower end portion of the outer rod 18 is provided with an operating cylinder 19 that can be loosely fitted to the upper portion 4 of the head body 1 of the excavating head 16.

At the lower end of the operation tube 19, operation edges 20 and 20 are respectively formed from lower edges facing the other side surface 3b of the base portion 3 of the head body 1 (the other side surface of the side surface 3a provided with the excavating arm). . At the first position (relative position between the outer rod 18 and the inner rod 21. lower position, FIG. 2), the operating edge 20 contacts the excavating arms 9, 9 during excavation of the pile hole shaft portion, and restricts the opening thereof. At the second position (relative position between the outer rod 18 and the inner rod 21; upper position; FIG. 3), the opening can be regulated by contacting the excavating arms 9 and 9 when excavating the bottom of the pile hole. .

The outer wall surface 2 of the lower end portion 22 of the inner rod 21.
A hooking protrusion 24 is provided on 2a so as to project toward the outer rod 18 side. The outer rod 18 is provided with a hooking vertical hole 26 into which the hooking protrusion 24 can be inserted. When the hooking vertical hole 26 is in the first position, the hooking protrusion 24 is arranged so that the upper edge 2 of the hooking vertical hole 26 is
7, the latching projection 24 is shaped so as to abut the lower edge 28 of the latching vertical hole 26 when in the second position. Therefore, the outer protrusion 18 and the inner rod 21 can move up and down between the upper edge 27 and the lower edge 28 of the latching vertical hole 26 (FIGS. 6A and 6B).

Further, a first horizontal hole 29 into which the hooking protrusion 24 can be inserted is connected to the lower end of the hooking vertical hole 26 of the outer rod 18. Similarly, a second lateral hole 30 into which the hooking protrusion 24 can be inserted is continuously provided at the upper end of the hooking vertical hole 26 of the outer rod.

The pile hole excavating rod 31 is constructed as described above (FIGS. 1 and 4).

Next, the use of the present invention based on the above-described embodiment, that is, the pile hole excavating method of the present invention will be described.

The pile hole excavating rod 31 is inserted through the hollow portion 34 of the hollow pile 33 (FIG. 1).

The drilling head 16 of the pile hole drilling rod 31 is projected from the tip of the hollow pile 33 so that the pile hole drilling rod 31 is
The hollow pile 33 is lowered while excavating the shaft portion 35 of the pile hole by rotating in the direction of arrow 37 (forward rotation) in FIG. 6A (FIG. 2). At this time, the hooking protrusion 24 of the inner rod 21 is in the first lateral hole 29 (FIG. 6C), and the relative position (first position) of the inner rod 21 and the outer rod 18 in the vertical direction is A predetermined excavation diameter can be maintained without the risk of displacement.

Next, when the 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 indicated by the arrow so that the latching protrusion 24 is located in the latching vertical hole 26. 39
Direction (or the inner rod 21 in the direction of the arrow 38. FIGS. 6 (a) and 6 (d)), the outer rod 18 is further raised (or the inner rod 21 is lowered), and the hooking protrusion is formed. 24 is brought into contact with the lower edge 28 of the hooking vertical hole 26 (see FIG. 6E, chain line 2).
4).

Then, the excavating rod 31 is rotated again in the direction of the arrow 37 (forward rotation) to excavate the expanded bottom portion 36 of the pile hole. At this time, the latching protrusion 24 is located inside the second lateral hole 30 (FIG. 6 (e)), and the vertical relative position (second position) of the inner rod 21 and the outer rod 18 does not deviate, and the predetermined position is maintained. The drilling diameter can be maintained. Further, the operation edge 20 of the outer rod 18 is at the second position located above the first position, and the swing width of the excavating arms 9, 9 of the excavating head 16 is
It is set larger than in the case of the first position. Therefore, it is possible to excavate the pile hole bottom expanding portion 36 having a predetermined diameter (FIG. 3).

The excavation of the pile holes is completed as described above,
The rotation of the drilling rod 31 is stopped, the cement milk is discharged from the discharge port 15, and the drilling rod 31 is fixed to the hollow portion 34 of the pile 33.
Is pulled up, the pile 33 is lowered, and the lower end portion is fixed in the expanded bottom portion 36 (not shown).

In the above-described embodiment, the construction of the excavating head 16 is not limited to that in the above-mentioned embodiment, but the structure is such that the shaft portion of the pile hole is excavated by rocking by the rotation of the rod, and the bottom portion is excavated by expanding. However, other structures can be used (not shown).

In the above embodiment, the inner rod 21
The outer rod 18 and the outer rod 18 have two relative positions in the up-and-down direction (first position, second position), and the inner rod 21 has a hooking projection 24, and the outer rod has a hooking vertical hole 26 and a horizontal hole 27. Two
Although 8 is provided, another structure may be used as long as the relative position of the inner rod 21 and the outer rod 18 in the vertical direction can be set to two positions (first position and second position). For example,
The outer rod 18 may be provided with a hooking projection 24, and the inner rod 21 may be provided with a hooking vertical hole 26 and hooking lateral holes 27, 28 (not shown).

In the above embodiment, the pile hole excavating rod 31 is used to excavate the pile hole. However, the inner and outer double rods are used to change the relative positions of the rods so that one of the rods is changed. If it is possible to operate the expansion of the fixed excavating rod and excavate the shaft portion and the expanded bottom portion of the pile hole by rotating the excavating rod in only one direction, a pile hole excavating rod of other structure can also be used.

[0027]

As described above, the inner and outer rods are moved up and down to change their relative positions, so that the digging arm of the digging head can be easily and reliably operated to spread the digging arm by the operation edge of the outer rod. There is an effect that the shaft portion and the expanded bottom portion can be surely excavated with a predetermined diameter.

Further, since the excavating arm swings only on one side of the surface of the head main body to which the excavating arm is attached, various measuring instruments and excavated soil extractors are installed on the side of the head main body to which the excavating arm is not attached. It is possible to secure a space to be used and effectively utilize the drilling head.

When the inner rod is provided with the hooking projection and the outer rod is provided with the hooking vertical hole and the hooking lateral hole, respectively, the hooking vertical hole and the hooking protrusion are guided to each other, and The first position and the second position of the rod and the outer rod in the vertical direction can be maintained, and the excavation rod can be reliably operated.

[Brief description of drawings]

FIG. 1 is a front view in which an inner rod and an outer rod according to an embodiment of the present invention are cut off, showing a state when not excavating.

FIG. 2 is a front view in which the inner and outer rods are similarly cut off, showing a shaft portion of a pile hole during excavation.

FIG. 3 is a front view in which the inner and outer rods are similarly cut off, showing a case of excavating the bottom of the pile hole.

FIG. 4 is a side view in which the inner and outer rods are similarly cut off, showing a state when not excavating.

5A is a cross-sectional view taken along the line AA in FIG.
(B) is a sectional view taken along line BB in FIG. 2.

6A and 6B are views showing a hooking state of a hooking protrusion of an inner rod and a hooking hole of an outer rod in an embodiment of the present invention, in which FIG. 6A is a partial perspective view and FIG. , (C) are schematic partial front views showing a shaft excavation state, (d) a state during switching, and (e) a bottom-expanded state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head body 3 Base part 7 Excavation blade 9 Excavation arm 13 Excavation blade 16 Excavation head 18 Outer rod 19 Operating tube 20 Operation edge 21 Inner rod 24 Engagement protrusion 26 Engagement vertical hole 29 First engagement lateral hole 30 Second engagement Horizontal hole 31 Pile hole drilling rod 33 Hollow pile 35 Shaft hole shaft 36 Bottom expansion of pile hole

Claims (4)

[Claims] 1. A double excavating rod having an inner rod inserted through an outer rod having an operating edge formed at a lower end thereof. An excavating head is connected to a lower end of the inner rod, and the double rod is rotated in one direction. While excavating the shaft portion of the pile hole, ascending or descending the outer rod to change the relative position of the operating edge and the excavating rod to expand the excavating blade of the excavating head, and then the double rod is removed. A method for excavating a bottom of a pile hole by rotating in a direction, and a method for excavating a pile hole in a medium excavation method. 2. A lower end of the inner rod of a double rod formed by inserting an inner rod through an outer rod having an operation edge formed at the lower end,
A digging head having a digging arm with a digging blade swingably attached is connected, the outer rod is hooked to the inner rod at a first position, and the double rod is rotated in one direction to move the first rod to the first position. The shaft portion of the pile hole is excavated by the excavating arm of the excavating head restricted to the operation edge in one position, then rotation of the double rod is stopped, and the outer rod is in the second position with respect to the inner rod. Up to the position where both rods are hooked, then the double rod is rotated in the one direction, and a pile hole is formed by the excavating arm of the excavating head regulated by the operating edge in the second position. A method for excavating a pile hole in a medium excavation method, which is characterized by excavating the bottom of a pile. 3. An excavating head having an excavating arm with an excavating blade is connected to the lower end of the inner rod so that the inner rod can be moved up and down, and the excavating arm is attached to the lower end edge of the outer rod. A pile hole excavating rod, characterized in that an operation edge capable of contacting with is formed. 4. 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 projection can be inserted is axially provided in the outer rod. A first hooking lateral hole into which the hooking protrusion can be inserted and hooked at a position corresponding to excavation of a shaft portion of the hole, and a second hook which can insert and hook the hooking protrusion at a position corresponding to when excavating the bottom of the pile hole. The pile hole excavating rod according to claim 3, wherein each of the stop holes is provided in series.