JP2002129862A - Excavating device for increasing diameter of lower part of deep hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excavating device for forming a recess of increased diameter in the lower part of a deep hole. SOLUTION: A support cylinder is vertically slidably fitted over the upper portion of a support rod and a movable sleeve with a bracket secured thereto is caused to abut against a flange at the lower end of the support cylinder and is rotatably and vertically slidably fitted over the support rod. A housing with a rotary drive built therein is vertically slidably and non-rotatably engaged with the outside of a column and a rotating member which is rotated by the drive is connected to the underside of the housing. A doglegged rotating excavating blade is journaled to the bracket of the rotating member at a position near the curved portion of the blade, with the end of the curved portion being journaled to the bracket of the movable sleeve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating apparatus for forming an enlarged diameter portion below a deep hole for a foundation of a building such as a steel tower.

[0002]

BACKGROUND OF THE INVENTION Steel towers, such as power transmission lines, are generally constructed in such a manner that the legs are fixed on a foundation such as concrete installed deep underground so that the required strength is obtained. This foundation is formed by pouring concrete into a deep hole excavated in the ground, but if the deep hole is a vertical wall cavity, a large diameter Holes must be drilled. Therefore, not only is a large excavating machine required, but also the amount of excavated residual soil to be processed and the amount of concrete to be buried are increased, causing problems such as difficulty in work and high cost.

[0003] In order to solve this problem, there has been proposed a method of constructing a foundation concrete in a deep hole of a different diameter in which the lower part of the hole is enlarged to obtain a desired strength.

[0004]

The above-mentioned foundation method has an advantage that a base having a large supporting strength can be obtained with a relatively small diameter deep hole. However, it is difficult to form such a different diameter deep hole manually. There is a need for an efficient and easy-to-use device that is dangerous and can be excavated with mechanical power.

Accordingly, it is an object of the present invention to provide an excavator capable of efficiently forming a large-diameter concave portion below a deep hole by a simple operation.

[0006]

In order to achieve the above-mentioned object, the present invention provides a large-diameter excavating apparatus in which a support cylinder is provided above a support rod inserted into a deep hole, and the support cylinder is connected to the support rod at a top dead center. A movable sleeve having a bracket fixed to a side surface is abutted against a lower end flange of the support cylinder and is rotatably and vertically slidably fitted on the support rod. A housing having a built-in rotation drive device and slidably and non-rotatably engaged with the outside of the support column; rotatably connected around the support column below the housing, the housing; A rotating member that is rotated by the rotary driving device; a tip bent inwardly in a U-shape, a portion near the bent portion is pivotally supported by an outer bracket of the rotating member, and a bent tip is attached to the bracket of the movable sleeve. Supported by a rotating digging edge open outward bent portion near shaft support by downward movement of the movable sleeve as the swing fulcrum; characterized by comprising a.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a vertical column 1 supported by being connected to an operation arm such as a power shovel.
A housing 3 in which a rotary drive device 2 such as a hydraulic motor is installed inside the support 1 so as to be slidably contacted with the outside of the support 1, and rotatable below the housing 3 around the support 1. A rotary member 4 connected to and rotated by a rotary driving device 2 in a housing 3, and a rotary excavating blade 6 pivotally supported by the rotary member 4 and opened outward by a downward movement of a movable sleeve 5 of a column 1 described later. It has.

The support column 1 has an elongated support rod 7 extending in the vertical direction, a hollow support cylinder 8 externally slidably mounted on the upper part of the support rod 7, and an abutting lower end of the support cylinder 8. A movable sleeve 5 having a hollow cylindrical shape is fitted to the support rod 7 vertically below and rotatably below the support rod 7.

The support cylinder 8 has a mounting portion 9 at an upper end thereof for connecting an arm of an earth-moving machine, a lower end thereof having a flange 10 abutting on the upper end of the movable sleeve 5, and a projection 11 formed on an inner surface of the support rod. 7 is engaged with a slit 12 formed in the upper axial direction so as to be vertically slidable. Accordingly, the support cylinder 8 slides up and down with respect to the support rod 7 and is locked to the support rod 7 at the top dead center by the engagement between the projection 11 and the upper end of the slit 12.

The movable sleeve 5 has a plurality of (four, front, rear, left and right, in the embodiment shown) integrally formed brackets 13 on the lower side surface. The lower sleeve 5 a slidably and at least a portion to which the bracket 13 is fixed is rotatably fitted to the support rod 7. In the embodiment shown in the drawing, a wear-resistant friction member 14 is integrally fixed to a portion of the support rod 7 which is in sliding contact with the movable sleeve 5 so that the rotational friction resistance of the movable sleeve 5 is reduced.

The movable sleeve 5 includes a lower sleeve 5 a to which the bracket 13 is fixed and a lower end flange 10 of the support cylinder 8.
May be formed integrally with the upper sleeve 5b, but the lower sleeve 5a is a member that rotates with respect to the friction member 14 of the support column 1, and requires lower wear resistance. The sleeve 5a and the upper sleeve 5b may be formed separately by different members.

A housing 3 incorporating a rotary drive 2
Is formed integrally with a sleeve 15 which is fitted to the support cylinder 8 of the column 1 so as to be slidable up and down.
5, the lower end of which is locked to the flange 10 of the support cylinder 8,
Thus, when the support tube 8 is lifted, the housing 3
In addition, the rotating member 4 is locked by the support tube 8 and is pulled up together. The rotation drive device 2 is mounted inside the housing 3 with the rotation drive shaft 2a protruding downward and outside.

The rotating member 4 integrally has a circular gear 16 on the upper surface of a donut disk having a diameter insertable into a deep hole having a predetermined diameter.
The drive shaft 2 a of the rotary drive device 2 is engaged with the gear 16, and is rotatably connected to a circular frame on the lower surface of the housing 3 via a swivel bearing 17. Also,
The rotating member 4 is provided under the movable sleeve 5 below the donut disk.
A mounting bracket 19 having a pin hole 18 at a position corresponding to the bracket 13 is integrally formed.

The rotary excavating blade 6 is formed of a member having an upper portion bent in an inwardly U-shape and an outer edge below the bent portion formed on a cutting edge 6a.
9 and is pivotally supported by the bracket 9 of the movable sleeve 5 via a long hole.

Preferably, a spring means 2 such as a fluid pressure cylinder or a coil spring for urging the rotary excavation blade 6 inwardly between a lower portion of the swing fulcrum of the rotary excavation blade 6 and a lower portion of the movable sleeve 5.
0 is provided so that the blade edge 6a of the rotary excavating blade 6 is vertically or inwardly closed when no downward pressing force is applied to the movable sleeve 5.

Preferably, a support plate 22 having a projection 21 on the lower surface is fixed to the tip of the column 1, so that the excavator is stably supported on the ground. In the figure, reference numeral 27,
Reference numeral 28 denotes a stopper that regulates the open / close position of the rotary excavation blade 6.

Next, the operation of the diameter expanding excavator of the present invention will be described. When excavating a large diameter recess in the lower side wall of a deep hole,
As shown in FIG.
The device is lifted and inserted into a deep hole 25 excavated in advance, so that the tip of the column 1 is supported at the bottom of the deep hole.

Next, as shown in FIGS. 3 and 4, when the support member 8 of the column 1 is pressed from above while rotating the rotary member 4 by the rotary driving device 2, the movable sleeve 5 which rotates integrally with the rotary excavation blade 6 is formed. Is pushed down along the support rod 7 of the support column 1 so that the rotary excavating blade 6 pivotally supported by the bracket 13 of the movable sleeve 5 opens outward around the swing fulcrum, and the outer cutting edge 6a Deep hole 25
The lower side wall is cut outward, and a large diameter portion 26 is formed in the deep hole 25.

After the excavation is completed, when the column 1 is lifted upward, the rotary excavator is automatically drawn inward in the reverse order of the drawing, and the housing 3 is attached to the lower flange 10 of the support cylinder 8.
And the excavator is pulled up from the deep hole 25.

[0020]

According to the excavator of the present invention, a large-diameter concave portion can be formed in a deep hole only by performing a pushing operation, so that the operation is simple, easy to use, and safe.

Since the structure is relatively simple and the number of parts is small, a device with less failure, low cost and high efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a deep hole diameter drilling apparatus showing one embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the large-diameter excavator according to the present invention.

FIG. 3 is an explanatory view of the operation of the diameter expanding excavator according to the present invention.

FIG. 4 is an explanatory view of the operation of the diameter expanding excavator according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Post 2 ... Rotation drive device 3 ... Housing 4 ... Rotating member 5 ... Movable sleeve 6 ... Rotating excavation blade 7 ... Support rod 8 ... Support cylinder 9 ... Mounting part 10 ... Flange 11 ... Projection 12 ... Slit 13 ... Bracket 14 ... Friction member 15 Sleeve 16 Gear 17 Rotating seat bearing 18 Pin hole 19 Bracket 20 Spring means 21 Projection 22 Support plate 23 Earthwork machine 24 Arm 25 Deep hole 26 Large diameter portion 27, 28 … Stopper

[Reference number] PAS00-019

Claims (3)

[Claims] 1. A support cylinder is fitted over a support rod inserted into a deep hole so as to be vertically slidable so as to be locked to the support rod at a top dead center, and a bracket is fixed to a side surface. A column having a movable sleeve in contact with the lower end flange of the support cylinder and being rotatably and vertically slidably fitted to the support rod; and a built-in rotation drive device, which is vertically slidable outside the column. And a housing which is non-rotatably engaged; a rotating member which is rotatably connected to the support column below the housing and which is rotated by a rotation driving device of the housing; Let
Rotation that pivotally supports the vicinity of the bending portion on the outer bracket of the rotating member, and pivotally supports the bending tip portion on the bracket of the movable sleeve, and opens the bending portion near the bending portion outward by pivoting the movable sleeve downward. A deep-hole lower-diameter drilling rig, comprising: a drilling blade; 2. A drilling apparatus according to claim 1, wherein a support plate fixed to a bottom surface of the deep hole is connected to a tip of the column. 3. The method according to claim 1, wherein the movable pillar of the support and the rotary excavation blade are
3. The diameter-enlarged excavator according to claim 1, further comprising spring means for urging the tip of the rotary excavation blade inward.