JPH0782977A - Excavator for pile with different diameter - Google Patents

Abstract

PURPOSE:To make it possible to surely enlarge an excavation blade in the case excavation having an enlarged diameter is carried out, to enable the execution of an enlarged diameter section for increasing bearing force surely by making it possible to look the enlargement with eye from the outside and to promote reliability. CONSTITUTION:In an excavator for pile with different diameter provided with an excavation enlarged blade 8 capable of coming in and out to an excavation head 2 loaded to the front end of an excavation rod 1 rotated with a free rotation driving device, the excavation enlarged blade 8 makes the excavation rod 1 as the internal and external multiple shaft. The internal and external multiple shaft is provided between both ends of an internal shaft 1a and an external shaft 1b of a force open mechanism slid each other with a center hole cylinder 4 as an expansion devices such as a hydraulic cylinder, etc. An indication arm 6 as a device to look the displacement of the internal and external multiple shaft with the center hole cylinder 4 with the eyeis so provided that an indicating body 6a of the front end thereof is exposed to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator for piles of different diameter, which can be provided with a diameter-expanded portion for increasing the bearing capacity of a bottom-expanded pile or the like.

[0002]

2. Description of the Related Art Generally, foundation piles, etc. are required to be constructed with a length until the tip of the pile reaches hard soil called a support layer, but in order to avoid the construction of long piles, In some cases, the bearing capacity may be increased by forming a so-called different diameter pile in which the tip of the bulge is inflated into a bulb shape.

As an excavator for constructing piles with different diameters such as bottom piles, after excavating to a predetermined depth, the one that allows the excavating blade to be enlarged by excavating by pushing in reverse or is pushed open. It was done like this.

[0004]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention At present, excavators for different diameter piles having a mechanical excavating and enlarging blade such as rotary enlarging and push-open enlarging, which are mainly used at present, are not only reliable for enlarging but also for excavating. Due to the expansion and contraction of the excavation head portion at the tip of the rod, it was not possible to detect whether or not the excavation head had expanded under the condition of being dug deep into the ground, and it was not possible to construct a reliable pile.

The object of the present invention is to eliminate the inconveniences of the above-mentioned conventional examples, to make sure that the digging blade expands, and to see the expansion directly from the outside or visually through an electrical detecting means. It is an object of the present invention to provide an excavator for piles with different diameters, which can surely construct a diameter-increased portion for increasing the force and improve reliability.

[0006]

In order to achieve the above object, the present invention has a different diameter pile in which an excavating head mounted on the tip of an excavating rod which is rotated by an arbitrary rotary driving means is provided with an excavating expanding blade capable of advancing and retracting. In the excavator for use, this digging enlargement blade has a digging rod as an inner / outer multi-axis, and the inner / outer multi-axis is provided between the inner / outer shaft ends of a push-opening mechanism that slides with each other by an expansion / contraction means such as a hydraulic cylinder. further,
A means for visually observing the displacement amount of the inner and outer multiple axes by the expanding and contracting means is provided on the outside, and a means for visually observing the displacement amount is provided with a tip end of an indicating arm for indicating the movement of the inner shaft by the expanding and contracting means such as a hydraulic cylinder. The gist is to provide it so as to be exposed to the outside.

[0007]

According to the present invention, when the expanding and contracting means such as the hydraulic cylinder is operated, the inner shaft is displaced with respect to the outer shaft, and the excavation enlarged blade is reliably advanced and retracted by the change in the distance between the ends of the inner and outer shafts. You can

Further, the displacement amount of the inner and outer shafts can be detected by detecting the displacement amount of the expanding and contracting means such as a hydraulic cylinder, and the advancing / retreating state of the excavating enlarged blade can be detected from outside by visual means. .

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a partially cutaway front view showing an embodiment of an excavator for different diameter piles of the present invention, FIG. 2 is a bottom view of an excavating head portion, and FIG. 3 is a vertical sectional front view of the excavating head when not enlarged. .

As shown in FIG. 1, as a so-called auger type excavator, an excavation head 2 is provided at the tip of an excavation rod 1 which is rotated by an arbitrary rotary drive means such as a hydraulic drive motor. Is the inner shaft 1a and the outer shaft 1
It is configured as a multiple rod consisting of a double tube of b.
The inner shaft 1a was a hollow shaft and used as a liquid injection pipe.

A hydraulic swivel 3 is attached to the upper portion of the excavating rod 1.
Further, a center hole cylinder 4 driven by oil sent from and discharged from the hydraulic swivel 3 is provided in the lower part of the cylinder, and the center hole cylinder 4 is connected to the inner shaft 1a passing through the center hole cylinder 4.

The center hole cylinder 4 is encased by a holder 5 around the center hole. The holder 5 is provided with a slit-shaped vertical window hole 5a and an indicating arm 6 for indicating the movement of the inner shaft 1a. The rod is provided on the inner shaft 1a or the center hole cylinder 4, and the tip of the rod is exposed as the display body 6a to the window hole 5a so that it is exposed to the outside.

The holder 5 constitutes the upper end portion of the outer shaft 1b of the excavating rod 1, but the outer shaft 1b may be a screw shaft having screw blades 9 continuously provided on the outer periphery thereof.

On the other hand, the excavating head 2 attached to the tip of the excavating rod 1 has the excavating bit 2a planted downward like a normal excavating head, and the tip of the inner shaft 1a which is also the liquid injection pipe is open. Although a discharge port 7 is provided, a drill bit 8b is provided on a link arm 8a that can be bent between the upper portion of the drill head 2, that is, the portion corresponding to the tip of the inner shaft 1a, and the tip of the outer shaft 1b adjacent thereto. An excavation enlargement blade 8 that is planted is provided.

In the example shown in the drawing, the three digging expansion blades 8 are 12 pieces.
Although they are provided at intervals of 0 °, the number may be single or in two opposite directions, or may be a plurality of three or more.

Explaining the method of use, the drive motor rotates the excavating rod 1 and the excavating head 2 to excavate the excavating head 2. At this time, the inner shaft 1a as the liquid injection pipe and the discharge port 7 are removed. Pour out the cement milk or water through.

When it is not necessary to expand the diameter, as shown in FIG. 3, the linking arm 8a of the excavating expanding blade 8 is substantially straight and does not project.

On the other hand, when it is necessary to expand the diameter, when the inner shaft 1a is pulled up by the center hole cylinder 4, the excavation expanding blade 8 has the link arm 8a largely bent as shown in FIG. Expansion drilling is carried out at. Then, the enlarged diameter excavation portion forms an enlarged diameter support portion in the pile.

When the center hole cylinder 4 moves, the indicator arm 6 moves together with the inner shaft 1a, and the display body 6a at the tip of the center arm cylinder 4 moves in the window hole 5a from bottom to top. The amount of displacement of the shaft 1a and the outer shaft 1b can be visually checked,
As a result, it is possible to know that the excavation expansion blade 8 has overhanged.

FIGS. 4 and 5 show a second embodiment of the present invention, and a slide cylinder 4'may be incorporated in the excavation head 2. Also in this case, the movement of the inner shaft 1a in the sliding cylinder 4'may be detected by providing the pointing arm 6 above the excavation rod 1.

Although the center hole cylinder 4 or the slide cylinder 4'is used as the means for enlarging the excavating and enlarging blade 8 in the above-mentioned embodiment, any expanding / contracting means such as a hydraulic cylinder may be used.

Further, the pointing arm 6 is provided as a means for detecting the displacement amount of the inner and outer shafts so as to be directly visible.
Alternatively, the amount of displacement of the inner and outer shafts may be known by electrically detecting the amount of displacement of the expansion / contraction means and displaying this detection signal on the screen.

[0023]

As described above, according to the excavator for different diameter piles of the present invention, the excavating blade can be surely expanded for expanding the diameter, and the expansion can be visually observed from the outside. Thus, it is possible to surely construct the expanded diameter portion for increasing the supporting force, and it is possible to enhance the reliability.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of a different diameter pile excavator of the present invention.

FIG. 2 is a bottom view of the excavating head portion showing the first embodiment of the excavator for different diameter piles of the present invention.

FIG. 3 is a vertical sectional front view of the excavator for different diameter piles according to the first embodiment of the present invention when the excavating head portion is not enlarged.

FIG. 4 is a front view of a second embodiment of the excavator for different diameter piles of the present invention when the excavation head portion is not enlarged.

FIG. 5 is a front view of the excavator for different diameter piles according to the second embodiment of the present invention when the excavation head portion is enlarged.

[Explanation of symbols]

1 ... Drilling rod 1a ... Inner shaft 1b ... Outer shaft 2 ... Drilling head 2a ... Drilling bit 3 ... Hydraulic swivel 4 ... Center hole cylinder 4 '... Sliding cylinder 5 ... Holder 5a ... Window hole 6 ... Pointing arm 6a ... Indicator 7 ... Discharge port 8 ... Enlargement blade for excavation 8a ... Link arm 8b ... Excavation bit 9 ... Screw blade

Claims (2)

[Claims] 1. A drilling machine for different diameter piles, wherein a drilling head mounted on the tip of a drilling rod rotated by an arbitrary rotary drive means is provided with a drilling expanding blade that can move forward and backward. An inner / outer multiple shaft is provided between the ends of the inner / outer shaft of a push-opening mechanism in which the inner / outer multiple shaft is slidable with each other by an expanding / contracting device such as a hydraulic cylinder. An excavator for piles of different diameter, which is provided with a means for visually observing the amount. 2. The excavation for piles with different diameters according to claim 1, wherein the means for visually observing the displacement amount is provided with an instruction arm for indicating the movement of the inner shaft by means of an expansion and contraction means such as a hydraulic cylinder so that its tip is exposed to the outside. Machine.