JP3194056B2 - Pile hole drilling rod - Google Patents

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 rod intended to increase the amount of excavated soil as much as possible.

[0002]

2. Description of the Related Art Conventionally, a drum for kneading excavated soil is fixed to a pile hole excavating rod at predetermined intervals, and muddy excavated soil (mud soil) is kneaded to a hole wall with the rotation of the excavating rod. It has achieved great results by strengthening hole walls and reducing the amount of excavated soil removed (Japanese Patent Publication No. 2-57195).

[0003]

In the above-mentioned conventional drill rod, if the cross-sectional area of the kneading drum is made close to the cross-sectional area of the pile hole, the excavated soil should be able to be mostly kneaded. With the increase in the cross-sectional area of the drum, the descent rod's descent resistance also increases, which causes a problem that the working efficiency is reduced. Also, when the excavation rod is lowered, even if the excavation progress can be performed even if the cross-sectional area of the kneading drum is somewhat close to the cross-sectional area of the pile hole, when the excavation rod is pulled out,
There is a problem that the resistance becomes extremely large and rapid removal becomes difficult, and there is a possibility that a vacuum phenomenon occurs and the pile hole wall is broken.

[0004]

According to the present invention, the gap for passing the mud of the kneading drum during excavation of a pile hole is reduced, and the gap for passing the mud of the kneading drum is increased when extracting a drilling rod. It solved the conventional problems. That is, the present invention relates to a drilling rod in which a plurality of kneading drums are attached to a rod, the drilling rod having at least a pair of fixed drums and a sliding drum slidable in an axial direction, and the sliding drum is used to excavate soil in the fixed drum. A pile drilling rod, wherein the sliding drum is detachably attached to the lower end of the fixed drum in order to adjust the passage gap between the fixed drum and the sliding drum. The fan-shaped kneading cylinder is configured to be fixed symmetrically in diameter. Another aspect of the present invention is a drilling rod in which a plurality of kneading drums are attached to a rod, wherein at least one drum is provided with a gap adjusting means for passing mud near the lower end thereof . The adjusting means is used when drilling
Reduces the amount of excavated soil as much as possible,
When pulling out, make sure that the pull-out resistance can be reduced.
Ru Kuiana drill rod der which is characterized in that form. The gap adjusting means is a sealing member for closing the mud passage gap of the fixed drum attached to the rod so as to be able to move up and down. Next, in another invention, the gap adjusting means is a sealing member for a mud passage gap of a fixed drum rotatably mounted on a rod, and the sealing member
When the pile hole is excavated,
When pulling out the rod, open the mud passage gap
It is configured so that In addition, the gap adjusting hand
The step is raised and lowered of the sealing member by mud pressure or mud pressure.
Or a drilling rod with a hole to control rotation
It is. Still another invention relates to a method in which a rod is kneaded with a plurality of pieces.
Drilling rod fitted with a drum for
For the individual drums, it is
At the time of excavation, the gap through which the mud passes
Structure that can increase the gap for passing the mud when pulling out
It is a drilling rod characterized by that .

[0005] In the above, when there are a plurality of fixed drums (fixed kneading drums), all or a part thereof is provided with a sliding drum or a means for adjusting a gap through which mud passes through the fixed drum. The gap adjusting means normally operates the sealing member automatically using the rotation of the drilling rod or the elevating movement, but does not hinder the ground operation using other means, for example, a wire.

The point is that the object can be achieved by effectively controlling the amount of excavated soil (mud) passing near the mounting drum during excavation and withdrawal. The shape of the kneading drum in the above is not limited to this embodiment, and can be applied to almost all conventionally used kneading drums. Further, since the stopper for regulating the movement of the sliding drum or the gap closing member can adjust the fixing position, the size of the adjusting gap can be regulated arbitrarily.

[0007]

According to the present invention, the size of the gap through which the excavated mud passes through the kneading drum fixed to the rod can be adjusted, so that the excavated soil can be discharged as little as possible during excavation, and when the rod is pulled out. Pull-out resistance can be reduced. When a sliding drum is used, the sliding drum automatically rises during excavation to regulate the gap between the fixed drum and the excavated soil, and when the rod is pulled out, the sliding drum automatically descends to excavate the fixed drum. Will be fully opened.
Similarly, with respect to the sealing member, the rotation or rotation of the rod automatically moves the sealing member, thereby regulating the gap through which the excavated soil passes.

[0008]

Embodiment 1 An embodiment of the present invention is shown in FIGS.
It will be described based on.

Below the fixed drum 2 fixed to the rod 1, an upper stopper 3 is fixed to the rod 1 so that the vertical position can be adjusted. The upper stopper 3 is, for example, a bolt 2
Since it is fixed to the rod 1 by 0, the vertical position of the bolt can be adjusted by changing the tightening position of the bolt. The mounting cylinder 5 of the sliding drum 4 is fitted below the fixed drum 2 of the rod 1, and the lower stopper 6 is fixed to the rod 1 below it. The fixed drum 2 is shown in FIG.
A semicircular flange 2b provided inside a flat fan-shaped drum cylinder (upper and lower obstruction) 2a is attached to the rod 1 facing each other and fastened and fixed by bolts 7,7. . The outer wall of the sector is formed with a different radius of curvature from the center of the wall 8 of the pile hole, as shown in FIG. 6, or the inner wall 8 of the pile hole is formed only at the center of the plane sector as shown in FIG. It is inscribed in.

Guide pieces 9 and 10 project from the upper and lower stoppers 3 and 6, respectively.
At upper and lower end portions of the mounting cylinder 5 formed by 4b, guide pieces 11 and 12 corresponding to the guide pieces 9 and 10 and cooperating to set the stationary direction of the sliding drum 4 are directed upward and downward, respectively. It is fixed. The guide pieces 9, 10, 11, and 12 are each inclined obliquely upward or downward so that the flat fan-shaped portion smoothly fits at a predetermined angle when the sliding drum 4 is raised or lowered. In the above embodiment, the sliding drum 4 and the fixed drum 2 are separated from each other as shown in FIG. 1 at the beginning of the excavation, but when the sliding drum 4 is subjected to mud pressure or muddy water pressure, the sliding drum 4 4 rises by rotating above the arrow 13 in FIG. 1, and finally approaches the fixed drum 2 as shown in FIG.
The position of the sliding drum 4 is determined by the guidance of the protruding pieces 9 and 11, and the rotation is prevented.

In the above embodiment, the upper stopper 3
Since the position of attachment to the rod can be adjusted, the distance between the sliding drum 4 and the fixed drum 2 can be regulated, and the gap through which mud soil (excavated soil and sewage) passes during excavation can be regulated. Therefore, the best kneading amount, the excavation speed, and the like can be selected in consideration of soil properties and the like.

[0012]

Second Embodiment Another embodiment of the present invention will be described with reference to FIGS.

That is, the closing blade 14 (sealing member) that rotates to the rod 1 at the lower end portion of the fixed drum 2 by the forward rotation of the rod 1 and regulates the mud passage gap of the fixed drum 2.
Is rotatably fitted, and the stopper 15 regulates the rotation angle of the closing blade 14 when the rod 1 rotates forward. Therefore, when the rod 1 rotates forward, the closing blade 14 closes (or shrinks) the gap for passing the muddy water of the fixed drum 2, and when the rod 1 rotates in the reverse direction, the closing blade 14 rotates below the fixed drum 2 to rotate the muddy water. Open the passage gap.

[0014]

Embodiment 3 FIGS. 10 and 11 show a rotary plate 16 for regulating the gap for passing muddy water to the lower end of the fixed drum 2.
Is rotatably mounted on the horizontal shaft 17. The horizontal axis 17
Is mounted near the lower end member of the gap of the fixed drum 2 at a substantially right angle to the rod 1 so as to be able to rotate about 90 degrees about the horizontal axis 17.

That is, during the excavation, the muddy water pushes up the turning plate 16 as shown by the arrow 18, so that the turning plate 16 turns in the same direction to close the muddy water passing gap of the fixed drum 2. On the other hand, when the rod 1 is pulled out, the muddy water indicates
9, the rotating plate 16 rotates in the same direction to open the passage gap (FIG. 11) .

[0016]

That is, the present invention regulates the gap through which the mud soil passes through the fixed drum during the excavation of the excavating rod to increase the amount of the excavated soil kneaded as much as possible, and opens the gap when the rod is pulled out. This has the effect of enabling quick withdrawal.

However, the adjustment of the size of the mud passage gap is as follows.
Since it can be easily performed by adjusting the position of the stopper, there is an effect that the best excavation conditions can be reproduced according to the soil condition and other conditions at the excavation site.

[Brief description of the drawings]

FIG. 1 is a partial front view of a drilling rod when the sliding drum of the present invention starts rising.

FIG. 2 is a partial front view when the sliding drum stops rising.

FIG. 3 is a partial front view of the excavating rod of the present invention.

FIG. 4 is a partially enlarged side view showing the relationship between the sliding drum and the upper and lower stoppers.

FIG. 5 is an enlarged cross-sectional plan view of the same.

FIG. 6 is an enlarged plan view of the same fixed drum embodiment.

FIG. 7 is an enlarged plan view of another embodiment.

FIG. 8 is a partial front view of another embodiment of the present invention.

FIG. 9 is an enlarged plan view of the same.

FIG. 10 is a partial front view of another embodiment.

FIG. 11 is a partial side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rod 2 Fixed drum 3 Upper stopper 4 Sliding drum 5 Mounting cylinder 6 Lower stopper 8 Inner wall of pile hole 9, 10 Guide piece of upper and lower stopper 11, 12 Guide piece fixed to sliding drum 14 Sealing blade 15 Stopper 16 Rotation Feather

Claims (7)

(57) [Claims] An excavating rod having a plurality of kneading drums mounted on a rod, the excavating rod having at least a pair of fixed drums and a sliding drum slidable in an axial direction, and excavating the fixed drum by the sliding drum. A pile hole excavation rod, wherein the sliding drum is detachably attached to a lower end of a fixed drum in order to adjust a gap through which soil passes. 2. The pile hole excavating rod according to claim 1, wherein each of the fixed drum and the sliding drum has at least two plane fan-shaped kneading cylinders fixed diametrically symmetrically. 3. A drilling rod having a plurality of kneading drums attached to a rod, wherein at least one of the drums is provided with a gap adjusting means for passing mud near the lower end thereof . Adjustment means are possible when excavating pile holes
To reduce the amount of excavated soil,
Is a pile drilling rod characterized in that it is configured to reduce pull-out resistance . 4. The excavation rod according to claim 3, wherein the gap adjusting means is a member for closing a gap for passing mud of a fixed drum attached to the rod so as to be able to move up and down. 5. The gap adjusting means, the closure member of the mud passage for clearance stationary drum mounted rotatably on the rod, the
The sealing member closes the mud passage gap when excavating a pile hole.
Or, at the time of pulling out the rod, the space for passing the mud
The drilling rod according to claim 3 , wherein the gap is opened . 6. The gap adjusting means is based on mud pressure or mud pressure.
As a result, the lifting member is controlled to move up and down or rotate.
Drilling a pile hole according to any one of claims 3 to 5.
rod. 7. A plurality of kneading drums are mounted on a rod.
With the drilling rod attached, at least one drum
In addition to having a gap through which mud passes,
The soil clearance is reduced, and the mud is removed when the drill rod is pulled out.
The feature is that it has a structure that can enlarge the passage gap of the soil.
Drilling rod.